Instead of a closed universe, science now presents us with one infinite in s.p.a.ce and time, having no limits here or there, at this end, so to speak, or at that, and as infinitely complex in internal structure as it is infinite in extent. Hence it is also an open world, an infinitely variegated one, a world which in the old sense can hardly be called a universe at all; so multiplex and far-reaching that it cannot be summed up and grasped in any one formula. And change rather than fixity is now a measure of "reality" or energy of being; change is omnipresent. The laws in which the modern man of science is interested are laws of motion, of generation and consequence. He speaks of law where the ancients spoke of kind and essence, because what he wants is a correlation of changes, an ability to detect one change occurring in correspondence with another. He does not try to define and delimit something remaining constant _in_ change. He tries to describe a constant order _of_ change. And while the word "constant" appears in both statements, the meaning of the word is not the same. In one case, we are dealing with something constant in _existence_, physical or metaphysical; in the other case, with something constant in _function_ and operation. One is a form of independent being; the other is a formula of description and calculation of interdependent changes.

In short, cla.s.sic thought accepted a feudally arranged order of cla.s.ses or kinds, each "holding" from a superior and in turn giving the rule of conduct and service to an inferior. This trait reflects and parallels most closely the social situation we were considering at the last hour.

We have a fairly definite notion of society as organized upon the feudal basis. The family principle, the principle of kinship is strong, and especially is this true as we ascend in the social scale. At the lower end, individuals may be lost more or less in the ma.s.s. Since all are parts of the common herd, there is nothing especial to distinguish their birth. But among the privileged and ruling cla.s.s the case is quite different. The tie of kinship at once marks a group off externally and gives it distinction, and internally holds all its members together.

Kinship, kind, cla.s.s, genus are synonymous terms, starting from social and concrete facts and going to the technical and abstract. For kinship is a sign of a common nature, of something universal and permanent running through all particular individuals, and giving them a real and objective unity. Because such and such persons are kin they are _really_, and not merely conventionally, marked off into a cla.s.s having something unique about it. All contemporary members are bound into an objective unity which includes ancestors and descendants and excludes all who belong to another kin or kind. a.s.suredly this parcelling out of the world into separate kinds, each having its qualitatively distinct nature in contrast with other species, binding numerically distinct individuals together, and preventing their diversities from exceeding fixed bounds, may without exaggeration be called a projection of the family principle into the world at large.

In a feudally organized society, moreover, each kinship group or species occupies a definite place. It is marked by the possession of a specific _rank_ higher or lower with respect to other grades. This position confers upon it certain privileges, enabling it to enforce certain claims upon those lower in the scale and entailing upon it certain services and homage to be rendered to superiors. The relationship of causation, so to speak, is up and down. Influence, power, proceeds from above to below; the activities of the inferior are performed with respect, quite literally, to what is above. Action and reaction are far from being equal and in opposite directions. All action is of one sort, of the nature of lordship, and proceeds from the higher to the lower.

Reaction is of the nature of subjection and deference and proceeds from lower to higher. The cla.s.sic theory of the const.i.tution of the world corresponds point by point to this ordering of cla.s.ses in a scale of dignity and power.

A third trait a.s.signed by historians to feudalism is that the ordering of ranks centres about armed service and the relationship of armed defense and protection. I am afraid that what has already been said about the parallelism of ancient cosmology with social organization may seem a fanciful a.n.a.logy; and if a comparison is also drawn in this last regard, there will be no doubt in your minds that a metaphor is being forced. Such is truly the case if we take the comparison too literally.

But not so, if we confine our attention to the notion of rule and command implied in both. Attention has already been called to the meaning that is now given the term law--a constant relationship among changes. Nevertheless, we often hear about laws which "govern" events, and it often seems to be thought that phenomena would be utterly disorderly were there not laws to keep them in order. This way of thinking is a survival of reading social relationships into nature--not necessarily a feudal relationship, but the relation of ruler and ruled, sovereign and subject. Law is a.s.similated to a command or order. If the factor of personal will is eliminated (as it was in the best Greek thought) still the idea of law or universal is impregnated with the sense of a guiding and ruling influence exerted from above on what is naturally inferior to it. The universal governs as the end and model which the artisan has in mind "governs" his movements. The Middle Ages added to this Greek idea of control the idea of a command proceeding from a superior will; and hence thought of the operations of nature as if they were a fulfilment of a task set by one who had authority to direct action.

The traits of the picture of nature drawn by modern science fairly spring by contrast into high relief. Modern science took its first step when daring astronomers abolished the distinction of high, sublime and ideal forces operating in the heavens from lower and material forces actuating terrestrial events. The supposed heterogeneity of substances and forces between heaven and earth was denied. It was a.s.serted that the same laws hold everywhere, that there is h.o.m.ogeneity of material and process everywhere throughout nature. The remote and esthetically sublime is to be scientifically described and explained in terms of homely familiar events and forces. The material of direct handling and observation is that of which we are surest; it is the better known.

Until we can convert the grosser and more superficial observations of far-away things in the heavens into elements identical with those of things directly at hand, they remain blind and not understood. Instead of presenting superior worth, they present only problems. They are not means of enlightenment but challenges. The earth is not superior in rank to sun, moon and stars, but it is equal in dignity, and its occurrences give the key to the understanding of celestial existences. Being _at_ hand, they are also capable of being brought _under_ our hand; they can be manipulated, broken up, resolved into elements which can be managed, combined at will in old and new forms. The net result may be termed, I think, without any great forcing, the subst.i.tution of a democracy of individual facts equal in rank for the feudal system of an ordered gradation of general cla.s.ses of unequal rank.

One important incident of the new science was the destruction of the idea that the earth is the centre of the universe. When the idea of a fixed centre went, there went with it the idea of a closed universe and a circ.u.mscribing heavenly boundary. To the Greek sense, just because its theory of knowing was dominated by esthetic considerations, the finite was the perfect. Literally, the finite was the finished, the ended, the completed, that with no ragged edges and unaccountable operations. The infinite or limitless was lacking in character just because it was in-finite. Being everything, it was nothing. It was unformed and chaotic, uncontrolled and unruly, the source of incalculable deviations and accidents. Our present feeling that a.s.sociates infinity with boundless power, with capacity for expansion that knows no end, with the delight in a progress that has no external limit, would be incomprehensible were it not that interest has shifted from the esthetic to the practical; from interest in beholding a harmonious and complete scene to interest in transforming an inharmonious one. One has only to read the authors of the transition period, say Giordano Bruno, to realize what a pent-in, suffocating sensation they a.s.sociated with a closed, finite world, and what a feeling of exhilaration, expansion and boundless possibility was aroused in them by the thought of a world infinite in stretch of s.p.a.ce and time, and composed internally of infinitesimal infinitely numerous elements. That which the Greeks withdrew from with repulsion they welcomed with an intoxicated sense of adventure. The infinite meant, it was true, something forever untraversed even by thought, and hence something forever unknown--no matter how great attainment in learning. But this "forever unknown"

instead of being chilling and repelling was now an inspiring challenge to ever-renewed inquiry, and an a.s.surance of inexhaustible possibilities of progress.

The student of history knows well that the Greeks made great progress in the science of mechanics as well as of geometry. At first sight, it appears strange that with this advance in mechanics so little advance was made in the direction of modern science. The seeming paradox impels us to ask why it was that mechanics remained a separate science, why it was not used in description and explanation of natural phenomena after the manner of Galileo and Newton. The answer is found in the social parallelism already mentioned. Socially speaking, machines, tools, were devices employed by artisans. The science of mechanics had to do with the kind of things employed by human mechanics, and mechanics were base fellows. They were at the lower end of the social scale, and how could light on the heavens, the highest, be derived from them? The application of considerations of mechanics to natural phenomena would moreover have implied an interest in the practical control and utilization of phenomena which was totally incompatible with the importance attached to final causes as fixed determiners of nature. All the scientific reformers of the sixteenth and seventeenth centuries strikingly agree in regarding the doctrine of final causes as _the_ cause of the failure of science. Why? Because this doctrine taught that the processes of nature are held in bondage to certain fixed ends which they must tend to realize. Nature was kept in leading strings; it was cramped down to production of a limited number of stereotyped results. Only a comparatively small number of things could be brought into being, and these few must be similar to the ends which similar cycles of change had effected in the past. The scope of inquiry and understanding was limited to the narrow round of processes eventuating in the fixed ends which the observed world offered to view. At best, invention and production of new results by use of machines and tools must be restricted to articles of transient dignity and bodily, not intellectual, use.

When the rigid clamp of fixed ends was taken off from nature, observation and imagination were emanc.i.p.ated, and experimental control for scientific and practical purposes enormously stimulated. Because natural processes were no longer restricted to a fixed number of immovable ends or results, anything might conceivably happen. It was only a question of what elements could be brought into juxtaposition so that they would work upon one another. Immediately, mechanics ceased to be a separate science and became an organ for attacking nature. The mechanics of the lever, wheel, pulley and inclined plane told accurately what happens when things in s.p.a.ce are used to move one another during definite periods of time. The whole of nature became a scene of pushes and pulls, of cogs and levers, of motions of parts or elements to which the formulae of movements produced by well-known machines were directly applicable.

The banishing of ends and forms from the universe has seemed to many an ideal and spiritual impoverishment. When nature was regarded as a set of mechanical interactions, it apparently lost all meaning and purpose. Its glory departed. Elimination of differences of quality deprived it of beauty. Denial to nature of all inherent longings and aspiring tendencies toward ideal ends removed nature and natural science from contact with poetry, religion and divine things. There seemed to be left only a harsh, brutal despiritualized exhibition of mechanical forces. As a consequence, it has seemed to many philosophers that one of their chief problems was to reconcile the existence of this purely mechanical world with belief in objective rationality and purpose--to save life from a degrading materialism. Hence many sought to re-attain by way of an a.n.a.lysis of the process of knowing, or epistemology, that belief in the superiority of Ideal Being which had anciently been maintained on the basis of cosmology. But when it is recognized that the mechanical view is determined by the requirements of an experimental control of natural energies, this problem of reconciliation no longer vexes us.

Fixed forms and ends, let us recall, mark fixed limits to change. Hence they make futile all human efforts to produce and regulate change except within narrow and unimportant limits. They paralyze constructive human inventions by a theory which condemns them in advance to failure. Human activity can conform only to ends already set by nature. It was not till ends were banished from nature that purposes became important as factors in human minds capable of reshaping existence. A natural world that does not subsist for the sake of realizing a fixed set of ends is relatively malleable and plastic; it may be used for this end _or_ that. That nature can be known through the application of mechanical formulae is the prime condition of turning it to human account. Tools, machines are means to be utilized. Only when nature is regarded as mechanical, is systematic invention and construction of machines relevant to nature's activities. Nature is subdued to human purpose because it is no longer the slave of metaphysical and theological purpose.

Bergson has pointed out that man might well be called _h.o.m.o Faber_. He is distinguished as the tool-making animal. This has held good since man was man; but till nature was construed in mechanical terms, the making of tools with which to attack and transform nature was sporadic and accidental. Under such circ.u.mstances it would not have occurred even to a Bergson that man's tool-making capacity was so important and fundamental that it could be used to define him. The very things that make the nature of the mechanical-physical scientist esthetically blank and dull are the things which render nature amenable to human control.

When qualities were subordinated to quant.i.tative and mathematical relationships, color, music and form disappeared from the object of the scientist's inquiry as such. But the remaining properties of weight, extension, numerable velocity of movement and so on were just the qualities which lent themselves to the subst.i.tution of one thing for another, to the conversion of one form of energy into another; to the effecting of transformations. When chemical fertilizers can be used in place of animal manures, when improved grain and cattle can be purposefully bred from inferior animals and gra.s.ses, when mechanical energy can be converted into heat and electricity into mechanical energy, man gains power to manipulate nature. Most of all he gains power to frame _new_ ends and aims and to proceed in regular system to their actualization. Only indefinite subst.i.tution and convertibility regardless of quality render nature manageable. The mechanization of nature is the condition of a practical and progressive idealism in action.

It thus turns out that the old, old dread and dislike of matter as something opposed to mind and threatening it, to be kept within the narrowest bounds of recognition; something to be denied so far as possible lest it encroach upon ideal purposes and finally exclude them from the real world, is as absurd practically as it was impotent intellectually. Judged from the only scientific standpoint, what it does and how it functions, matter means conditions. To respect matter means to respect the conditions of achievement; conditions which hinder and obstruct and which have to be changed, conditions which help and further and which can be used to modify obstructions and attain ends. Only as men have learned to pay sincere and persistent regard to matter, to the conditions upon which depends negatively and positively the success of all endeavor, have they shown sincere and fruitful respect for ends and purposes. To profess to have an aim and then neglect the means of its execution is self-delusion of the most dangerous sort. Education and morals will begin to find themselves on the same road of advance that say chemical industry and medicine have found for themselves when they too learn fully the lesson of wholehearted and unremitting attention to means and conditions--that is, to what mankind so long despised as material and mechanical. When we take means for ends we indeed fall into moral materialism. But when we take ends without regard to means we degenerate into sentimentalism. In the name of the ideal we fall back upon mere luck and chance and magic or exhortation and preaching; or else upon a fanaticism that will force the realization of preconceived ends at any cost.

I have touched in this lecture upon many things in a cursory way. Yet there has been but one point in mind. The revolution in our conceptions of nature and in our methods of knowing it has bred a new temper of imagination and aspiration. It has confirmed the new att.i.tude generated by economic and political changes. It has supplied this att.i.tude with definite intellectual material with which to formulate and justify itself.

In the first lecture it was noted that in Greek life prosaic matter of fact or empirical knowledge was at a great disadvantage as compared with the imaginative beliefs that were bound up with special inst.i.tutions and moral habitudes. Now this empirical knowledge has grown till it has broken its low and limited sphere of application and esteem. It has itself become an organ of inspiring imagination through introducing ideas of boundless possibility, indefinite progress, free movement, equal opportunity irrespective of fixed limits. It has reshaped social inst.i.tutions, and in so far developed a new morale. It has achieved ideal values. It is convertible into creative and constructive philosophy.

Convertible, however, rather than already converted. When we consider how deeply embedded in customs of thought and action the cla.s.sic philosophy came to be and how congenial it is to man's more spontaneous beliefs, the throes that attended its birth are not to be wondered at.

We should rather wonder that a view so upsetting, so undermining, made its way without more persecutions, martyrdoms and disturbances. It certainly is not surprising that its complete and consistent formulation in philosophy has been long delayed. The main efforts of thinkers were inevitably directed to minimizing the shock of change, easing the strains of transition, mediating and reconciling. When we look back upon almost all of the thinkers of the seventeenth and eighteenth centuries, upon all excepting those who were avowedly sceptical and revolutionary, what strikes us is the amount of traditional subject-matter and method that is to be found even among those who were regarded as most advanced.

Men cannot easily throw off their old habits of thinking, and never can throw off all of them at once. In developing, teaching and receiving new ideas we are compelled to use some of the old ones as tools of understanding and communication. Only piecemeal, step-by-step, could the full import of the new science be grasped. Roughly speaking, the seventeenth century witnessed its application in astronomy and general cosmology; the eighteenth century in physics and chemistry; the nineteenth century undertook an application in geology and the biological sciences.

It was said that it has now become extremely difficult to recover the view of the world which universally obtained in Europe till the seventeenth century. Yet after all we need only recur to the science of plants and animals as it was before Darwin and to the ideas which even now are dominant in moral and political matters to find the older order of conceptions in full possession of the popular mind. Until the dogma of fixed unchangeable types and species, of arrangement in cla.s.ses of higher and lower, of subordination of the transitory individual to the universal or kind had been shaken in its hold upon the science of life, it was impossible that the new ideas and method should be made at home in social and moral life. Does it not seem to be the intellectual task of the twentieth century to take this last step? When this step is taken the circle of scientific development will be rounded out and the reconstruction of philosophy be made an accomplished fact.

CHAPTER IV

CHANGED CONCEPTIONS OF EXPERIENCE AND REASON

What is experience and what is Reason, Mind? What is the scope of experience and what are its limits? How far is it a sure ground of belief and a safe guide of conduct? Can we trust it in science and in behavior? Or is it a quagmire as soon as we pa.s.s beyond a few low material interests? Is it so shaky, shifting, and shallow that instead of affording sure footing, safe paths to fertile fields, it misleads, betrays, and engulfs? Is a Reason outside experience and above it needed to supply a.s.sured principles to science and conduct? In one sense, these questions suggest technical problems of abstruse philosophy; in another sense, they contain the deepest possible questionings regarding the career of man. They concern the criteria he is to employ in forming his beliefs; the principles _by_ which he is to direct his life and the ends _to_ which he is to direct it. Must man transcend experience by some organ of unique character that carries him into the super-empirical?

Failing this, must he wander sceptical and disillusioned? Or is human experience itself worth while in its purposes and its methods of guidance? Can it organize itself into stable courses or must it be sustained from without?

We know the answers of traditional philosophy. They do not thoroughly agree among themselves, but they agree that experience never rises above the level of the particular, the contingent, and the probable. Only a power transcending in origin and content any and all conceivable experience can attain to universal, necessary and certain authority and direction. The empiricists themselves admitted the correctness of these a.s.sertions. They only said that since there is no faculty of Pure Reason in the possession of mankind, we must put up with what we have, experience, and make the most possible out of it. They contented themselves with sceptical attacks upon the transcendentalist, with indications of the ways in which we might best seize the meaning and good of the pa.s.sing moment; or like Locke, a.s.serted that in spite of the limitation of experience, it affords the light needed to guide men's footsteps modestly in conduct. They affirmed that the alleged authoritative guidance by a higher faculty had practically hampered men.

It is the function of this lecture to show how and why it is now possible to make claims for experience as a guide in science and moral life which the older empiricists did not and could not make for it.

Curiously enough, the key to the matter may be found in the fact that the old notion of experience was itself a product of experience--the only kind of experience which was then open to men. If another conception of experience is now possible, it is precisely because the quality of experience as it may now be lived has undergone a profound social and intellectual change from that of earlier times. The account of experience which we find in Plato and Aristotle is an account of what Greek experience actually was. It agrees very closely with what the modern psychologist knows as the method of learning by trial and error as distinct from the method of learning by ideas. Men tried certain acts, they underwent certain sufferings and affections. Each of these in the time of its occurrence is isolated, particular--its counterpart is transient appet.i.te and transient sensation. But memory preserves and acc.u.mulates these separate incidents. As they pile up, irregular variations get cancelled, common features are selected, reinforced and combined. Gradually a habit of action is built up, and corresponding to this habit there forms a certain generalized picture of an object or situation. We come to know or note not merely this particular which as a particular cannot strictly be known at all (for not being cla.s.sed it cannot be characterized and identified) but to recognize it as man, tree, stone, leather--an individual of a certain kind, marked by a certain universal form characteristic of a whole species of thing.

Along with the development of this common-sense knowledge, there grows up a certain regularity of conduct. The particular incidents fuse, and a _way_ of acting which is general, as far as it goes, builds up. The skill develops which is shown by the artisan, the shoemaker, the carpenter, the gymnast, the physician, who have regular ways of handling cases. This regularity signifies, of course, that the particular case is not treated as an isolated particular, but as one of a kind, which therefore demands a _kind_ of action. From the mult.i.tude of particular illnesses encountered, the physician in learning to cla.s.s some of them as indigestion learns also to treat the cases of the cla.s.s in a common or general way. He forms the rule of recommending a certain diet, and prescribing a certain remedy. All this forms what we call experience. It results, as the ill.u.s.tration shows, in a certain general insight and a certain organized ability in action.

But needless to insist, the generality and the organization are restricted and fallible. They hold, as Aristotle was fond of pointing out, usually, in most cases, as a rule, but not universally, of necessity, or as a principle. The physician is bound to make mistakes, because individual cases are bound to vary unaccountably: such is their very nature. The difficulty does not arise in _a_ defective experience which is capable of remedy in some better experience. Experience itself, as such, is defective, and hence default is inevitable and irremediable. The only universality and certainty is in a region above experience, that of the rational and conceptual. As the particular was a stepping-stone to image and habit, so the latter may become a stepping-stone to conceptions and principles. But the latter leave experience behind, untouched; they do not react to rectify it. Such is the notion which still lingers in the contrast of "empirical" and "rational" as when we say that a certain architect or physician is empirical, not scientific in his procedures. But the difference between the cla.s.sic and the modern notion of experience is revealed in the fact that such a statement is now a charge, a disparaging accusation, brought against _a_ particular architect or physician. With Plato, Aristotle and the Scholastic, it was a charge against the callings, since they were modes of experience. It was an indictment of all practical action in contrast with conceptual contemplation.

The modern philosopher who has professed himself an empiricist has usually had a critical purpose in mind. Like Bacon, Locke, Condillac and Helvetius, he stood face to face with a body of beliefs and a set of inst.i.tutions in which he profoundly disbelieved. His problem was the problem of attack upon so much dead weight carried uselessly by humanity, crushing and distorting it. His readiest way of undermining and disintegrating was by appealing to experience as a final test and criterion. In every case, active reformers were "empiricists" in the philosophical sense. They made it their business to show that some current belief or inst.i.tution that claimed the sanction of innate ideas or necessary conceptions, or an origin in an authoritative revelation of reason, had in fact proceeded from a lowly origin in experience, and had been confirmed by accident, by cla.s.s interest or by biased authority.

The philosophic empiricism initiated by Locke was thus disintegrative in intent. It optimistically took it for granted that when the burden of blind custom, imposed authority, and accidental a.s.sociations was removed, progress in science and social organization would spontaneously take place. Its part was to help in removing the burden. The best way to liberate men from the burden was through a natural history of the origin and growth in the mind of the ideas connected with objectionable beliefs and customs. Santayana justly calls the psychology of this school a malicious psychology. It tended to identify the history of the formation of certain ideas with an account of the things to which the ideas refer--an identification which naturally had an unfavorable effect on the things. But Mr. Santayana neglects to notice the social zeal and aim latent in the malice. He fails to point out that this "malice" was aimed at inst.i.tutions and traditions which had lost their usefulness; he fails to point out that to a large extent it was true of them that an account of their psychological origin was equivalent to a destructive account of the things themselves. But after Hume with debonair clarity pointed out that the a.n.a.lysis of beliefs into sensations and a.s.sociations left "natural" ideas and inst.i.tutions in the same position in which the reformers had placed "artificial" ones, the situation changed. The rationalists employed the logic of sensationalistic-empiricism to show that experience, giving only a heap of chaotic and isolated particulars, is as fatal to science and to moral laws and obligations as to obnoxious inst.i.tutions; and concluded that "Reason" must be resorted to if experience was to be furnished with any binding and connecting principles. The new rationalistic idealism of Kant and his successors seemed to be necessitated by the totally destructive results of the new empirical philosophy.

Two things have rendered possible a new conception of experience and a new conception of the relation of reason to experience, or, more accurately, of the place of reason _in_ experience. The primary factor is the change that has taken place in the actual nature of experience, its contents and methods, as it is actually lived. The other is the development of a psychology based upon biology which makes possible a new scientific formulation of the nature of experience.

Let us begin with the technical side--the change in psychology. We are only just now commencing to appreciate how completely exploded is the psychology that dominated philosophy throughout the eighteenth and nineteenth centuries. According to this theory, mental life originated in sensations which are separately and pa.s.sively received, and which are formed, through laws of retention and a.s.sociation, into a mosaic of images, perceptions, and conceptions. The senses were regarded as gateways or avenues of knowledge. Except in combining atomic sensations, the mind was wholly pa.s.sive and acquiescent in knowing. Volition, action, emotion, and desire follow in the wake of sensations and images.

The intellectual or cognitive factor comes first and emotional and volitional life is only a consequent conjunction of ideas with sensations of pleasure and pain.

The effect of the development of biology has been to reverse the picture. Wherever there is life, there is behavior, activity. In order that life may persist, this activity has to be both continuous and adapted to the environment. This adaptive adjustment, moreover, is not wholly pa.s.sive; is not a mere matter of the moulding of the organism by the environment. Even a clam acts upon the environment and modifies it to some extent. It selects materials for food and for the sh.e.l.l that protects it. It does something to the environment as well as has something done to itself. There is no such thing in a living creature as mere conformity to conditions, though parasitic forms may approach this limit. In the interests of the maintenance of life there is transformation of some elements in the surrounding medium. The higher the form of life, the more important is the active reconstruction of the medium. This increased control may be ill.u.s.trated by the contrast of savage with civilized man. Suppose the two are living in a wilderness.

With the savage there is the maximum of accommodation to given conditions; the minimum of what we may call hitting back. The savage takes things "as they are," and by using caves and roots and occasional pools leads a meagre and precarious existence. The civilized man goes to distant mountains and dams streams. He builds reservoirs, digs channels, and conducts the waters to what had been a desert. He searches the world to find plants and animals that will thrive. He takes native plants and by selection and cross-fertilization improves them. He introduces machinery to till the soil and care for the harvest. By such means he may succeed in making the wilderness blossom like the rose.

Such transformation scenes are so familiar that we overlook their meaning. We forget that the inherent power of life is ill.u.s.trated in them. Note what a change this point of view entails in the traditional notions of experience. Experience becomes an affair primarily of doing.

The organism does not stand about, Micawber-like, waiting for something to turn up. It does not wait pa.s.sive and inert for something to impress itself upon it from without. The organism acts in accordance with its own structure, simple or complex, upon its surroundings. As a consequence the changes produced in the environment react upon the organism and its activities. The living creature undergoes, suffers, the consequences of its own behavior. This close connection between doing and suffering or undergoing forms what we call experience. Disconnected doing and disconnected suffering are neither of them experiences.

Suppose fire encroaches upon a man when he is asleep. Part of his body is burned away. The burn does not perceptibly result from what he has done. There is nothing which in any instructive way can be named experience. Or again there is a series of mere activities, like twitchings of muscles in a spasm. The movements amount to nothing; they have no consequences for life. Or, if they have, these consequences are not connected with prior doing. There is no experience, no learning, no c.u.mulative process. But suppose a busy infant puts his finger in the fire; the doing is random, aimless, without intention or reflection. But something happens in consequence. The child undergoes heat, he suffers pain. The doing and undergoing, the reaching and the burn, are connected. One comes to suggest and mean the other. Then there is experience in a vital and significant sense.

Certain important implications for philosophy follow. In the first place, the interaction of organism and environment, resulting in some adaptation which secures utilization of the latter, is the primary fact, the basic category. Knowledge is relegated to a derived position, secondary in origin, even if its importance, when once it is established, is overshadowing. Knowledge is not something separate and self-sufficing, but is involved in the process by which life is sustained and evolved. The senses lose their place as gateways of knowing to take their rightful place as stimuli to action. To an animal an affection of the eye or ear is not an idle piece of information about something indifferently going on in the world. It is an invitation and inducement to act in a needed way. It is a clue in behavior, a directive factor in adaptation of life in its surroundings. It is urgent not cognitive in quality. The whole controversy between empiricism and rationalism as to the intellectual worth of sensations is rendered strangely obsolete. The discussion of sensations belongs under the head of immediate stimulus and response, not under the head of knowledge.

As a _conscious_ element, a sensation marks an interruption in a course of action previously entered upon. Many psychologists since the time of Hobbes have dwelt upon what they call the relativity of sensations. We _feel_ or sense cold in transition from warmth rather than absolutely; hardness is sensed upon a background of less resistance; a color in contrast with pure light or pure dark or in contrast with some other hue. A continuously unchanged tone or color cannot be attended to or sensed. What we take to be such monotonously prolonged sensations are in truth constantly interrupted by incursions of other elements, and represent a series of excursions back and forth. This fact was, however, misconstrued into a doctrine about the nature of knowledge. Rationalists used it to discredit sense as a valid or high mode of knowing things, since according to it we never get hold of anything _in itself_ or intrinsically. Sensationalists used it to disparage all pretence at absolute knowledge.

Properly speaking, however, this fact of the relativity of sensation does not in the least belong in the sphere of knowing. Sensations of this sort are emotional and practical rather than cognitive and intellectual. They are shocks of change, due to interruption of a prior adjustment. They are signals to redirections of action. Let me take a trivial ill.u.s.tration. The person who is taking notes has no sensation of the pressure of his pencil on the paper or on his hand as long as it functions properly. It operates merely as stimulus to ready and effective adjustment. The sensory activity incites automatically and unconsciously its proper motor response. There is a preformed physiological connection, acquired from habit but ultimately going back to an original connection in the nervous system. If the pencil-point gets broken or too blunt and the habit of writing does not operate smoothly, there is a conscious shock:--the feeling of something the matter, something gone wrong. This emotional change operates as a stimulus to a needed change in operation. One looks at his pencil, sharpens it or takes another pencil from one's pocket. The sensation operates as a pivot of readjusting behavior. It marks a break in the prior routine of writing and the beginning of some other mode of action.

Sensations are "relative" in the sense of marking transitions in habits of behavior from one course to another way of behaving.

The rationalist was thus right in denying that sensations as such are true elements of knowledge. But the reasons he gave for this conclusion and the consequences he drew from it were all wrong. Sensations are not parts of _any_ knowledge, good or bad, superior or inferior, imperfect or complete. They are rather provocations, incitements, challenges to an act of inquiry which is to _terminate_ in knowledge. They are not ways of knowing things inferior in value to reflective ways, to the ways that require thought and inference, because they are not ways of knowing at all. They are stimuli to reflection and inference. As interruptions, they raise the questions: What does this shock mean? What is happening?

What is the matter? How is my relation to the environment disturbed?

What should be done about it? How shall I alter my course of action to meet the change that has taken place in the surroundings? How shall I readjust my behavior in response? Sensation is thus, as the sensationalist claimed, the beginning of knowledge, but only in the sense that the experienced shock of change is the necessary stimulus to the investigating and comparing which eventually produce knowledge.

When experience is aligned with the life-process and sensations are seen to be points of readjustment, the alleged atomism of sensations totally disappears. With this disappearance is abolished the need for a synthetic faculty of super-empirical reason to connect them. Philosophy is not any longer confronted with the hopeless problem of finding a way in which separate grains of sand may be woven into a strong and coherent rope--or into the illusion and pretence of one. When the isolated and simple existences of Locke and Hume are seen not to be truly empirical at all but to answer to certain demands of their theory of mind, the necessity ceases for the elaborate Kantian and Post-Kantian machinery of _a priori_ concepts and categories to synthesize the alleged stuff of experience. The true "stuff" of experience is recognized to be adaptive courses of action, habits, active functions, connections of doing and undergoing; sensori-motor co-ordinations. Experience carries principles of connection and organization within itself. These principles are none the worse because they are vital and practical rather than epistemological. Some degree of organization is indispensable to even the lowest grade of life. Even an amoeba must have some continuity in time in its activity and some adaptation to its environment in s.p.a.ce.

Its life and experience cannot possibly consist in momentary, atomic, and self-enclosed sensations. Its activity has reference to its surroundings and to what goes before and what comes after. This organization intrinsic to life renders unnecessary a super-natural and super-empirical synthesis. It affords the basis and material for a positive evolution of intelligence as an organizing factor within experience.

Nor is it entirely aside from the subject to point out the extent in which social as well as biological organization enters into the formation of human experience. Probably one thing that strengthened the idea that the mind is pa.s.sive and receptive in knowing was the observation of the helplessness of the human infant. But the observation points in quite another direction. Because of his physical dependence and impotency, the contacts of the little child with nature are mediated by other persons. Mother and nurse, father and older children, determine what experiences the child shall have; they constantly instruct him as to the meaning of what he does and undergoes. The conceptions that are socially current and important become the child's principles of interpretation and estimation long before he attains to personal and deliberate control of conduct. Things come to him clothed in language, not in physical nakedness, and this garb of communication makes him a sharer in the beliefs of those about him. These beliefs coming to him as so many facts form his mind; they furnish the centres about which his own personal expeditions and perceptions are ordered. Here we have "categories" of connection and unification as important as those of Kant, but empirical not mythological.

From these elementary, if somewhat technical considerations, we turn to the change which experience itself has undergone in the pa.s.sage from ancient and medieval to modern life. To Plato, experience meant enslavement to the past, to custom. Experience was almost equivalent to established customs formed not by reason or under intelligent control but by repet.i.tion and blind rule of thumb. Only reason can lift us above subjection to the accidents of the past. When we come to Bacon and his successors, we discover a curious reversal. Reason and its bodyguard of general notions is now the conservative, mind-enslaving factor.

Experience is the liberating power. Experience means the new, that which calls us away from adherence to the past, that which reveals novel facts and truths. Faith in experience produces not devotion to custom but endeavor for progress. This difference in temper is the more significant because it was so unconsciously taken for granted. Some concrete and vital change must have occurred in actual experience as that is lived.

For, after all, the thought of experience follows after and is modelled upon the experience actually undergone.

When mathematics and other rational sciences developed among the Greeks, scientific truths did not react back into daily experience. They remained isolated, apart and super-imposed. Medicine was the art in which perhaps the greatest amount of positive knowledge was obtained, but it did not reach the dignity of science. It remained an art. In practical arts, moreover, there was no conscious invention or purposeful improvement. Workers followed patterns that were handed down to them, while departure from established standards and models usually resulted in degenerate productions. Improvements came either from a slow, gradual, and unacknowledged acc.u.mulation of changes or else from some sudden inspiration, which at once set a new standard. Being the result of no conscious method, it was fittingly attributed to the G.o.ds. In the social arts, such a radical reformer as Plato felt that existing evils were due to the absence of such fixed patterns as controlled the productions of artisans. The ethical purport of philosophy was to furnish them, and when once they were inst.i.tuted, they were to be consecrated by religion, adorned by art, inculcated by education and enforced by magistrates so that alteration of them would be impossible.

It is unnecessary to repeat what has been so often dwelt upon as to the effect of experimental science in enabling man to effect a deliberate control of his environment. But since the impact of this control upon the traditional notion of experience is often overlooked, we must point out that when experience ceased to be empirical and became experimental, something of radical importance occurred. Aforetime man employed the results of his prior experience only to form customs that henceforth had to be blindly followed or blindly broken. Now, old experience is used to suggest aims and methods for developing a new and improved experience.

Consequently experience becomes in so far constructively self-regulative. What Shakespeare so pregnantly said of nature, it is "made better by no mean, but nature makes that mean," becomes true of experience. We do not merely have to repeat the past, or wait for accidents to force change upon us. We _use_ our past experiences to construct new and better ones in the future. The very fact of experience thus includes the process by which it directs itself in its own betterment.