[Footnote 5: These quotations are taken from Ozanam's Dante and Catholic Philosophy, published by the Cathedral Library a.s.sociation, New York, 1897. ]

It was not with regard to explosives alone, however, that Roger Bacon was to make great advances and still more marvelous antic.i.p.ations in physical science. He was not, as is sometimes claimed for him, either the inventor of the telescope or of the theory of lenses. He did more, however, than perhaps anyone else to make the principles of lenses clear and to establish them on a mathematical basis. His traditional connection with the telescope can probably be traced to the fact that he was very much interested in astronomy and the relations of the heavens to the earth. He pointed out very clearly the errors which had crept into the Julian calendar, calculated exactly how much of a correction was needed in order to restore the year to its proper place, and suggested the method by which future errors of this kind could be avoided. His ideas were too far beyond his century to be applied in a practical way, but they were not to be without their effect and it is said that they formed the basis of the subsequent correction of the calendar in the time of Pope Gregory XIII three centuries later.

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It is rather surprising to find how much besides the theory of lenses Friar Bacon had succeeded in finding out in the department of optics.

He taught, for instance, the principle of the aberration of light, and, still more marvelous to consider, taught that light did not travel instantaneously but had a definite rate of motion, though this was extremely rapid. It is rather difficult to understand how he reached this conclusion since light travels so fast that as far as regards any observation that can be made upon earth, the diffusion is practically instantaneous. It was not for over three centuries later that Romer, the German astronomer, demonstrated the motion of light and its rate, by his observations upon the moons of Jupiter at different phases of the earth's...o...b..t, which showed that the light of these moons took a definite and quite appreciable time to reach the earth after their eclipse by the planet was over.

We are not surprised to find that Bacon should praise those of his contemporaries who devoted themselves to mathematics and to experimental observations in science. Of one of his correspondents who even from distant Italy sent him his observations in order that he might have the great Franciscan's precious comments on them. Bacon has given quite a panegyric. The reasons for his praise, however, are so different from those which are ordinarily proclaimed to have been the sources of laudation in distant medieval scientific circles, that we prefer to quote Bacon's own words from the Opus Tertium. Bacon is talking of Petrus Peregrinus and says: "I know of only one person who deserves praise for his work in experimental philosophy, for he does not care for the discourses of men and their wordy warfare, but quietly and diligently pursues the works of wisdom. Therefore, what others grope after blindly, as bats in the evening twilight, this man contemplates in all their brilliancy because he is a master of experiment. Hence, he knows all natural science whether pertaining to medicine and alchemy, or to matters celestial and terrestrial.

"He has worked diligently in the smelting of ores as also in the working of minerals; he is thoroughly acquainted with all sorts of arms and implements used in military service and in hunting, besides which he is skilled in agriculture and in the measurement of lands.

{45} It is impossible to write a useful or correct treatise in experimental philosophy without mentioning this man's name.

Moreover, he pursues knowledge for its own sake; for if he wished to obtain royal favor, he could easily find sovereigns who would honor and enrich him."

[Ill.u.s.tration]

CATHEDRAL (YORK)

[Ill.u.s.tration]

CATHEDRAL (HEREFORD)

Lest it should be thought that these expressions of laudatory appreciation of the great Thirteenth Century scientist are dictated more by the desire to magnify his work and to bring out the influence in science of the Churchmen of the period, it seems well to quote an expression of opinion from the modern historian of the inductive sciences, whose praise is scarcely if any less outspoken than that of others whom we have quoted and who might be supposed to be somewhat partial in their judgment. This opinion will fortify the doubters who must have authority and at the same time sums up very excellently the position which Roger Bacon occupies in the History of Science.

Dr. Whewell says that Roger Bacon's Opus Majus is "the encyclopedia and Novam Organon of the Thirteenth Century, a work equally wonderful with regard to its general scheme and to the special treatises with which the outlines of the plans are filled up. The professed object of the work is to urge the necessity of a reform in the mode of philosophizing, to set forth the reasons why knowledge had not made a greater progress, to draw back attention to the sources of knowledge which had been unwisely neglected, to discover other sources which were yet almost untouched, and to animate men in the undertaking by a prospect of the vast advantages which it offered. In the development of this plan all the leading portions of science are expanded in the most complete shape which they had at that time a.s.sumed; and improvements of a very wide and striking kind are proposed in some of the princ.i.p.al branches of study. Even if the work had no leading purposes it would have been highly valuable as a treasure of the most solid knowledge and soundest speculations of the time; even if it had contained no such details it would have been a work most remarkable for its general views and scope."

It is only what might have been expected, however, from {46} Roger Bacon's training that he should have made great progress in the physical sciences. At the University of Paris his favorite teacher was Albertus Magnus, who was himself deeply interested in all the physical sciences, though he was more concerned with the study of chemical problems than of the practical questions which were to occupy his greatest pupil. There is no doubt at all that Albertus Magnus accomplished a great amount of experimental work in chemistry and had made a large series of actual observations. He was a theologian as well as a philosopher and a scientist. Some idea of the immense industry of the man can be obtained from the fact that his complete works as published consist of some twenty large folio volumes, each one of which contains on the average at least 500,000 words.

Among these works are many treatises relating to chemistry. The t.i.tles of some of them will serve to show how explicit was Albert in his consideration of various chemical subjects. He has treatises concerning Metals and Minerals; concerning Alchemy; A Treatise on the Secret of Chemistry; A Concordance, that is a Collection of observations from many sources with regard to the Philosopher's Stone; A Brief Compend on the Origin of the Metals; A Treatise on Compounds; most of these are to be found in his works under the general heading "Theatrum Chemic.u.m."

It is not surprising for those who know of Albert's work, to find that his pupil Roger Bacon defined the limits of chemistry very accurately and showed that he understood exactly what the subject and methods of investigation must be, in order that advance should be made in it. Of chemistry he speaks in his "Opus Tertium" in the following words: "There is a science which treats of the generation of things from their elements and of all inanimate things, as of the elements and liquids, simple and compound, common stones, gems and marble, gold and other metals, sulphur, salts, pigments, lapis lazuli, minium and other colors, oils, bitumen, and infinite more of which we find nothing in the books of Aristotle; nor are the natural philosophers nor any of the Latins acquainted with these things."

In physics Albertus Magnus was, if possible, more advanced {47} and progressive even than in chemistry. His knowledge in the physical sciences was not merely speculative, but partook to a great degree of the nature of what we now call applied science. Humboldt, the distinguished German natural philosopher of the beginning of the Nineteenth Century, who was undoubtedly the most important leader in scientific thought in his time and whose own work was great enough to have an enduring influence in spite of the immense progress of the Nineteenth Century, has summed up Albert's work and given the headings under which his scientific research must be considered. He says:

"Albertus Magnus was equally active and influential in promoting the study of natural science and of the Aristotelian philosophy. His works contain some exceedingly acute remarks on the organic structure and physiology of plants. One of his works bearing the t.i.tle of 'Liber Cosmographicus de Natura Locorum,' is a species of physical geography. I have found in it considerations on the dependence of temperature concurrently on lat.i.tude and elevation, and on the effect of different angles of incidence of the sun's rays in heating the ground, _which have excited my surprise_."

To take up some of Humboldt's headings in their order and ill.u.s.trate them by quotations from Albert himself and from condensed accounts as they appear in his biographer Sighart and in Christian Schools and Scholars [Footnote 6], will serve to show at once the extent of Albert's knowledge and the presumptuous ignorance of those who make little of the science of the medieval period. When we have catalogued, for instance, the many facts with regard to astronomy and the physics of light that are supposed to have come to human ken much later, yet may be seen to have been clearly within the range of Albert's knowledge, and evidently formed the subject of his teaching at various times at both Paris and Cologne, for they are found in his authentic works, we can scarcely help but be amused at the pretentious misconception that has relegated their author to a place in education so trivial as is that which is represented in many minds by the term scholastic.

[Footnote 6: Christian Schools and Scholars. Drane.]

"He decides that the Milky Way is nothing but a vast {48} a.s.semblage of stars, but supposes naturally enough that they occupy the orbit which receives the light of the sun. The figures visible on the moon's disc are not, he says, as. .h.i.therto has been supposed, reflections of the seas and mountains of the earth, but configurations of her own surface. He notices, in order to correct it, the a.s.sertion of Aristotle that lunar rainbows appear only twice in fifty years; 'I myself,' he says have observed two in a single year.' He has something to say on the refraction of a solar ray, notices certain crystals which have a power of refraction, and remarks that none of the ancients and few moderns were acquainted with the properties of mirrors."

Albert's great pupil Roger Bacon is rightly looked upon as the true father of inductive science, an honor that history has unfortunately taken from him to confer it undeservedly on his namesake of four centuries later, but the teaching out of which Roger Bacon was to develop the principles of experimental science can be found in many places in his master's writings. In Albert's tenth book, wherein he catalogues and describes all the trees, plants, and herbs known in his time, he observes: "All that is here set down is the result of our own experience, or has been borrowed from authors whom we know to have written what their personal experience has confirmed: for in these matters experience alone can give certainty" (_experimentum solum certificat in talibus_). "Such an expression," says his biographer, "which might have proceeded from the pen of (Francis) Bacon, argues in itself a prodigious scientific progress, and shows that the medieval friar was on the track so successfully pursued by modern natural philosophy. He had fairly shaken off the shackles which had hitherto tied up discovery, and was the slave neither of Pliny nor of Aristotle."

Botany is supposed to be a very modern science and to most people Humboldt's expression that he found in Albertus Magnus's writings some "exceedingly acute remarks on the organic structure and physiology of plants" will come as a supreme surprise. A few details with regard to Albert's botanical knowledge, however, will serve to heighten that surprise and to show, that the foolish tirades of modern sciolists, {49} who have often expressed their wonder that with all the beauties of nature around them, these scholars of the Middle Ages did not devote themselves to nature study, are absurd, because if the critics but knew it there was profound interest in nature and all her manifestations and a series of discoveries that antic.i.p.ated not a little of what we consider most important in our modern science. The story of Albert's botanical knowledge has been told in a single very full paragraph by his biographer. Sighart also quotes an appreciative opinion from a modern German botanist which will serve to dispel any doubts with regard to Albert's position in botany that modern students might perhaps continue to harbor, unless they had good authority to support their opinion, though of course it will be remembered that the main difference between the medieval and the modern mind is only too often said to be, that the medieval required an authority while the modern makes its opinion for itself. Even the most skeptical of modern minds however, will probably be satisfied by the following paragraph.

"He was acquainted with the sleep of plants, with the periodical opening and closing of blossoms, with the diminution of sap through evaporation from the cuticle of the leaves, and with the influence of the distribution of the bundles of vessels on the folial indentations. His minute observations on the forms and variety of plants intimate an exquisite sense of floral beauty. He distinguished the star from the bell-floral, tells us that a red rose will turn white when submitted to the vapor of sulphur and makes some very sagacious observations on the subject of germination... . The extraordinary erudition and originality of this treatise (his tenth book) has drawn from M. Meyer the following comment: 'No Botanist who lived before Albert can be compared to him, unless Theophrastus, with whom he was not acquainted; and after him none has painted nature in such living colors or studied it so profoundly until the time of Conrad Gesner and Cesalpino.' All honor, then, to the man who made such astonishing progress in the science of nature as to find no one, I will not say to surpa.s.s, but even to equal him for the s.p.a.ce of three centuries."

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We point out in the chapter on Geography and Exploration how much this wonderful Thirteenth Century added to the knowledge of geographical science. Even before the great explorers of this time, however, had accomplished their work, this particular branch of science had made such great progress as would bring it quite within the domain of what we call the science of geography at the present time. When we remember how much has been said about the ignorance of the men of the later Middle Ages as regards the shape of the earth and its inhabitants, and how many foolish notions they are supposed to have accepted with regard to the limitation of possible residents of the world and the queer ideas as to the antipodes, the following pa.s.sages taken from Albert's biographer will serve better than anything else to show how absurdly the traditional notions with regard to this time and its knowledge, have been permitted by educators to tinge what are supposed to be serious opinions with regard to the subject matters of education in that early university period:

"He treats as fabulous the commonly-received idea, in which Bede had acquiesced, that the region of the earth south of the equator was uninhabitable, and considers, that from the equator to the South Pole, the earth was not only habitable, but in all probability actually inhabited, except directly at the poles, where he imagines the cold to be excessive. If there be any animals there, he says, they must have very thick skins to defend them from the rigor of the climate, and they are probably of a white color. The intensity of cold, is however, tempered by the action of the sea. He describes the antipodes and the countries they comprise, and divides the climate of the earth into seven zones. He smiles with a scholar's freedom at the simplicity of those who suppose that persons living at the opposite region of the earth must fall off, an opinion that can only rise out of the grossest ignorance, 'for when we speak of the lower hemisphere, this must be understood merely as relatively to ourselves.' It is as a geographer that Albert's superiority to the writers of his own time chiefly appears. Bearing in mind the astonishing ignorance which then prevailed on this subject, it is truly admirable to find him correctly tracing the chief mountain chains of Europe, with the rivers which take {51} their source in each; remarking on portions of coast which have in later times been submerged by the ocean, and islands which have been raised by volcanic action above the level of the sea; noticing the modification of climate caused by mountains, seas and forests, and the division of the human race whose differences he ascribes to the effect upon them of the countries they inhabit! In speaking of the British Isles he alludes to the commonly-received idea that another distant island called Tile or Thule, existed far in the Western Ocean, uninhabitable by reason of its frightful climate, but which, he says, has perhaps not yet been visited by man."

Nothing will so seriously disturb the complacency of modern minds as to the wonderful advances that have been made in the last century in all branches of physical science as to read Albertus Magnus' writings.

Nothing can be more wholesomely chastening of present day conceit than to get a proper appreciation of the extent of the knowledge of the Schoolmen.

Albertus Magnus' other great pupil besides Roger Bacon was St. Thomas Aquinas. If any suspicion were still left that Thomas did not appreciate just what the significance of his teachings in physics was, when he announced that neither matter nor force could ever be reduced to nothingness, it would surely be removed by the consideration that he had been for many years in intimate relations with Albert and that he had probably also been close to Roger Bacon. After a.s.sociation with such men as these, any knowledge he displays with regard to physical science can scarcely be presumed to have been stumbled upon unawares.

St. Thomas himself has left three treatises on chemical subjects and it is said that the first occurrence of the word amalgam can be traced to one of these treatises. Everybody was as much interested then, as we are at the present time, in the transformation of metals and mercury with its silvery sheen, its facility to enter into metallic combinations of all kinds, and its elusive ways, naturally made it the center of scientific interest quite as radium is at the present moment. Further material with regard to St. Thomas and also to the subject of education will be found in the chapter, Aquinas the Scholar.

After this brief review of only a few of the things that they taught in science at the Thirteenth Century universities, most {52} people will scarcely fail to wonder how such peculiar erroneous impressions with regard to the uselessness of university teaching and training have come to be so generally accepted. The fault lies, of course, with those who thought they knew something about university teaching, and who, because they found a few things that now look ridiculous, as certain supposed facts of one generation always will to succeeding generations who know more about them, thought they could conclude from these as to the character of the whole content of medieval education.

It is only another example of what Artemus Ward pointed out so effectively when he said that "there is nothing that makes men so ridiculous as the knowing so many things that aint so." We have been accepting without question ever so many things that simply are not so with regard to these wonderful generations, who not only organized the universities but organized the teaching in them on lines not very different from those which occupy people seven centuries later.

What would be the most amusing feature, if it were not unfortunately so serious an arraignment of the literature that has grown up around these peculiar baseless notions with regard to scholastic philosophy, is the number of men of science who have permitted themselves to make fun of certain supposed lucubrations of the great medieval philosophers. It is not so very long ago that, as pointed out by Harper in the Metaphysics of the School, Professor Tate in a lecture on Some Recent Advances in Physical Science repeated the old slander that even Aquinas occupied the attention of his students with such inane questions as: "How many angels could dance on the point of a needle?" Modern science very proudly insists that it occupies itself with observations and concerns itself little with authority. Prof.

Tate in this unhappy quotation, shows not only that he has made no personal studies in medieval philosophy but that he has accepted a very inadequate authority for the statements which he makes with as much confidence as if they had been the result of prolonged research in this field. Many other modern scientists (?) have fallen into like blunders. (For Huxley's opinion see Appendix.)

The modern student, as well as the teacher, is p.r.o.ne to wonder what were the methods of study and the habits of life {53} of the students of the Thirteenth Century, and fortunately we have a short sketch, written by Robert of Sorbonne, the famous founder of the Sorbonne, in which he gives advice to attendants at that inst.i.tution as to how they should spend their time, so that at least we are able to get a hint of the ideals that were set before the student. Robert, whose long experience of university life made him thoroughly competent to advise, said:

"The student who wishes to make progress ought to observe six essential rules.

"First: He ought to consecrate a certain hour every day to the study of a determined subject, as St. Bernard counselled his monks in his letter to the Brothers of the Mont Dieu.

"Second: He ought to concentrate his attention upon what he reads and ought not to let it pa.s.s lightly. There is between reading and study, as St. Bernard says, the same difference as between a host and a guest, between a pa.s.sing salutation exchanged in the street and an embrace prompted by an unalterable affection.

"Third: He ought to extract from the daily study one thought, some truth or other, and engrave it deeply upon his memory with special care. Seneca said _'c.u.m multa percurreris in die, unum tibi elige quod illa die excoquas'_--When you have run over many things in a day select one for yourself which you should digest well on that day.

"Fourth: Write a resume of it, for words which are not confided to writing fly as does the dust before the wind.

"Fifth: Talk the matter over with your fellow-students, either in the regular recitation or in your familiar conversation. This exercise is even more profitable than study for it has as its result the clarifying of all doubts and the removing of all the obscurity that study may have left. Nothing is perfectly known unless it has been tried by the tooth of disputation.

"Sixth: Pray, for this is indeed one of the best ways of learning.

St. Bernard teaches that study ought to touch the heart and that one should profit by it always by elevating the heart to G.o.d, _without, however, interrupting the study_."

Sorbonne proceeds in a tone that vividly recalls the modern university professor who has seen generation after generation {54} of students and has learned to realize how many of them waste their time.

"Certain students act like fools; they display great subtility over nonsensical subjects and exhibit themselves devoid of intelligence with regard to their most important studies. So as not to seem to have lost their time they gather together many sheets of parchment, make thick volumes of note books out of them, with many a blank interval, and cover them with elegant binding in red letters. Then they return to the paternal domicile with their little sack filled up with knowledge which can be stolen from them by any thief that comes along, or may be eaten by rats or by worms or destroyed by fire or water.

"In order to acquire instruction the student must abstain from pleasure and not allow himself to be hampered by material cares.

There was at Paris not long since two teachers who were great friends. One of them had seen much, had read much and used to remain night and day bent over his books. He scarcely took the time to say an 'Our Father.' Nevertheless he had but four students. His colleague possessed a much less complete library, was less devoted to study and heard ma.s.s every morning before delivering his lecture.

In spite of this, his cla.s.sroom was full. 'How do you do it?' asked his friend. 'It is very simple,' said his friend smiling. 'G.o.d studies for me. I go to ma.s.s and when I come back I know by heart all that I have to teach.'"

"Meditation," so Sorbonne continues, "is suitable not only for the master, but the good student ought also to go and take his promenade along the banks of the Seine, not to play there, but in order to repeat his lesson and meditate upon it."

These instructions for students are not very different from those that would be issued by an interested head of a university department to the freshmen of the present day. His insistence, especially on the difference between reading and study, might very well be taken to heart at the present time, when there seems to be some idea that reading of itself is sufficient to enable one to obtain an education.

The lesson of learning one thing a day and learning that well, might have been selected as a motto for students for all succeeding generations with manifest advantage to the success of college study.

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