1. Celestial phenomena.

2. Atmosphere.

3. Globe.

4. Substance of earth, air, fire, and water.

5. Genera, species, etc.[2]

{461}

Descartes, following Bacon, had much to do with the establishment of method, although he laid more stress upon deduction than upon induction. With Bacon he believed that there was need of a better method of finding out the truth than that of logic. He was strong in his refusal to recognize anything as true that he did not understand, and had no faith in the mere a.s.sumption of truth, insisting upon absolute proof derived through an intelligent order. Perhaps, too, his idea was to establish universal mathematics, for he recognized measurements and lines everywhere in the universe, and recognized the universality of all natural phenomena, laying great stress on the solution of problems by measurement. He was a fore runner of Newton and many other scientists, and as such represents an epoch-making period in scientific development.

The trend of thought by a few leaders having been directed to the observation of nature and the experimentation with natural phenomena, the way was open for the shifting of the centre of thought of the entire world. It only remained now for each scientist to work out in his own way his own experiments. The differentiation of knowledge brought about many phases of thought and built up separate divisions of science. While each one has had an evolution of its own, all together they have worked out a larger progress of the whole. Thus Gilbert (1540-1603) carried on practical experiments and observations with the lodestone, or magnet, and thus made a faint beginning of the study of electrical phenomena which in recent years has played such an important part in the progress of the world. Harvey (1578-1657) by his careful study of the blood determined its circulation through the heart by means of the arterial and venous systems. This was an important step in leading to anatomical studies and set the world far ahead of the medical studies of the Arabians.

Galileo (1564-1642), in his study of the heavenly bodies and the universe, carried out the suggestion of Copernicus a century before of the revolution of the earth on its axis, to {462} take the place of the old theory that the sun revolved around the earth. Indeed, this was such a disturbing factor among churchmen, theologians, and pseudo-philosophers that Galileo was forced to recant his statements.

In 1632 he published at Florence his _Dialogue on the Ptolemaic and Copernican Systems of the World_. For this he was cited to Rome, his book ordered to be burned, and he was sentenced to be imprisoned, to make a recantation of his errors, and by way of penance to recite the seven penitential psalms once a week.

It seems very strange that a man who could make a telescope to study the heavenly bodies and carry on experiments with such skill that he has been called the founder of experimental science could be forced to recant the things which he was convinced by experiment and observation to be true. However, it must be remembered that the mediaeval doctrine of authority had taken possession of the minds of the world of thinkers to such an extent that to oppose it openly seemed not only sacrilege but the tearing down of the walls of faith and destroying the permanent structure of society. Moreover, the minds of all thinkers were trying to hold on to the old while they developed the new, and not one could think of destroying the faith of the church. But the church did not so view this, and took every opportunity to suppress everything new as being destructive of the church.

No one could contemplate the tremendous changes that might have been made in the history of the world if the church could have abandoned its theological dogmas far enough to welcome all new truth that was discovered in G.o.d's workshop. To us in the twentieth century who have such freedom of expressing both truth and untruth, it is difficult to realize to what extent the authorities of the Middle Ages tried to seal the fountains of truth. Picture a man kneeling before the authorities at Rome and stating: "With a sincere heart and unfeigned faith I abjure, curse, and detest the said errors and heresies. I swear that for the future I will never say nor a.s.sert anything verbally or in writing which may give rise to a {463} similar suspicion against me."[3] Thus he was compelled to recant and deny his theory that the earth moves around the sun.

_Measurement in Scientific Research_.--All scientific research involves the recounting of recurring phenomena within a given time and within a given s.p.a.ce. In order, therefore, to carry on systematic research, methods of measuring are necessary. We can thus see how mathematics, although developed largely through the study of astronomy, has been necessary to all investigation. Ticho Brahe and Kepler may be said to have accentuated the phase of accurate measurement in investigation.

They specialized in chemistry and astronomy, all measurements being applied to the heavenly bodies. Their main service was found in accurate records of data. Kepler maintained "that every planet moved in an ellipse of which the sun occupied one focus." He also held "that the square of the periodic time of any planet is proportional to the cube of its mean distance from the sun," and "that the area swept by the radius vector from the planet to the sun is proportional to the time."[4] He was much aided in his measurements by the use of a system of logarithms invented by John Napier (1614). Many measurements were established regarding heat, pressure of air, and the relation of solids and liquids.

Isaac Newton, by connecting up a single phenomenon of a body falling a distance of a few feet on the earth with all similar phenomena, through the law of gravitation discovered the unity of the universe. Though Newton carried on important investigations in astronomy, studied the refraction of light through optic gla.s.ses, was president of the Royal Society, his chief contribution to the sciences was the tying together of the sun, the planets, and the moons of the solar system by the attraction of gravitation. Newton was able to carry along with his scientific investigations a profound reverence for Christianity. That he was not attacked shows that there had {464} been considerable progress made in toleration of new ideas. With all of his greatness of vision, he had the humbleness of a true scientist. A short time before his death he said: "I know not what I may appear to the world; but to myself I seem to have been only like a boy playing on the seash.o.r.e, and diverting myself in now and then finding a smoother pebble, or a prettier sh.e.l.l, than ordinary, whilst the great ocean of truth lay all undiscovered before me."

_Science Develops from Centres_.--Bodies of truth in the world are all related one to another. Hence, when a scientist investigates and experiments along a particular line, he must come in contact more or less with other lines. And while there is a great differentiation in the discovery of knowledge by investigation, no single truth can ever be established without more or less relation to all other truths.

Likewise, scientists, although working from different centres, are each contributing in his own way to the establishment of universal truth.

Even in the sixteenth century scientists began to co-operate and interchange views, and as soon as their works were published, each fed upon the others as he needed in advancing his own particular branch of knowledge.

It is said that Bacon in his _New Atlantis_ gave such a magnificent dream of an opportunity for the development of science and learning that it was the means of forming the Royal Society in England. That a.s.sociation was the means of disseminating scientific truth and encouraging investigation and publication of results. It was a tremendous advancement of the cause of science, and has been a type for the formation of hundreds of other organizations for the promotion of scientific truth.

_Science and Democracy_.--While seeking to extend knowledge to all cla.s.ses of people, science paves the way for recognition of equal rights and privileges. Science is working all the time to be free from the slavery of nature, and the result of its operations is to cause mankind to be free from the slavery of man. Therefore, liberty and science go hand in hand in {465} their development. It is interesting to note in this connection that so many scientists have come from groups forming the ordinary occupations of life rather than, as we might expect, from the privileged cla.s.ses who have had leisure and opportunity for development. Thus, "Pasteur was the son of a tanner, Priestley of a cloth-maker, Dalton of a weaver, Lambert of a tailor, Kant of a saddler, Watt of a ship-builder, Smith of a farmer, and John Ray was, like Faraday, the son of a blacksmith. Joule was a brewer.

Davy, Scheele, Dumas, Balard, Liebig, Wohler, and a number of other distinguished chemists were apothecaries' apprentices."[5]

Science also is a great leveller because all scientists are bowing down to the same truth discovered by experimentation or observation, and, moreover, scientists are at work in the laboratories and cannot be dogmatic for any length of time. But scientists arise from all cla.s.ses of people, so far as religious or political belief is concerned. Many of the foremost scientists have been distributed among the Roman Catholics, Anglicans, Calvinists, Quakers, Unitarians, and Agnostics.

The only test act that science knows is that of the recognition of truth.

Benjamin Franklin was a printer whose scientific investigations were closely intermingled with the problems of human rights. His experiments in science were subordinate to the experiments of human society. His great contribution to science was the identification of lightning and the spark from a Leyden jar. For the identification and control of lightning he received a medal from the Royal Society. The discussion of liberty and the part he took in the independence of the colonies of America represent his greatest contribution to the world.

To us he is important, for he embodied in one mind the expression of scientific and political truth, showing that science makes for democracy and democracy for science. In each case it is the choice of the liberalized mind.

_The Study of the Biological and Physical Sciences_.--The last century is marked by scientific development along several {466} rather distinct lines as follows: the study of the earth, or geology; animal and vegetable life, or biology; atomic a.n.a.lysis, or chemistry; biochemistry; physics, especially that part relating to electricity and radioactivity; and more recently it might be stated that investigations are carried on in psychology and sociology, while mathematics and astronomy have made progress.

The main generalized point of research, if it could be so stated, is the discovery of law and order. This has been demonstrated in the development of chemistry under the atomic theory; physics in the molecular theory; the law of electrons in electricity, and the evolutionary theory in the study of biology. Great advance has been made in the medical sciences, including the knowledge of the nature and prevention of disease. Though a great many new discoveries and, out of new discoveries, new inventions have appeared along specific lines and various sciences have advanced with accuracy and precision, perhaps the evolutionary theory has changed the thought of the world more than any other. It has connected man with the rest of the universe and made him a definite part of it.

_The Evolutionary Theory_.--The geography of the earth as presented by Lyell, the theory of population of Malthus, and the _Origin of the Species_ and the _Descent of Man_ by Darwin changed the preconceived notions of the creation of man. Slowly and without ostentation science everywhere had been forcing all nature into unity controlled by universal laws. Traditional belief was not prepared for the bold statement of Darwin that man was part of the slow development of animal life through the ages.

For 2,000 years or more the philosophic world had been wedded to the idea of a special creation of man entirely independent of the creation of the rest of the universe. All conceptions of G.o.d, man, and his destiny rested upon the recognition of a separate creation. To deny this meant a reconstruction of much of the religious philosophy of the world. Persons {467} were needlessly alarmed and began to attack the doctrine on the a.s.sumption that anything interfering with the long-recognized interpretation of the relation of man to creation was wrong and was inst.i.tuted for the purpose of tearing down the ancient landmarks.

Darwin accepted in general the Lamarckian doctrine that each succeeding generation would have new characters added to it by the modification of environmental factors and by the use and disuse of organs and functions. Thus gradually under such selection the species would be improved. But Darwin emphasized selection through hereditary traits.

Subsequently, Weismann and others reinterpreted Darwin's theory and strengthened its main propositions, abandoning the Lamarckian theory of use and disuse. Mendel, De Vries, and other biologists have added to the Darwinian theory by careful investigations into the heredity of plants and animals, but because Darwin was the first to give clear expression to the theory of evolution, "Darwinism" is used to express the general theory.

Cosmic evolution, or the development of the universe, has been generally acknowledged by the acceptance of the results of the studies of geology, astronomy, and physics. History of plant and animal life is permanently written in the rocks, and their evolutionary process so completely demonstrated in the laboratory that few dare to question it.

Modern controversy hinges upon the a.s.sumption that man as an animal is not subjected to the natural laws of other animals and of plants, but that he had a special creation. The maintenance of this belief has led to many crude and unscientific notions of the origin of man and the meaning of evolution.

Evolution is very simple in its general traits, but very complex in its details. It is a theory of process and not a theory of creation. It is continuous, progressive change, brought about by natural forces and in accordance with natural laws. The evolutionist studies these changes and records the results obtained thereby. The scientist thus discovers new truths, {468} establishes the relation of one truth to another, enlarges the boundary of knowledge, extends the horizon of the unknown, and leaves the mystery of the beginning of life unsolved. His laboratory is always open to retest and clarify his work and to add new knowledge as fast as it is acquired.

Evolution as a working theory for science has correlated truths, unified methods, and furnished a key to modern thought. As a co-operative science it has had a stimulating influence on all lines of research, not only in scientific study of physical nature, but also in the study of man, for there are natural laws as well as man-made laws to be observed in the development of human society.

Some evolutionary scientists will be dogmatic at times, but they return to their laboratories and proceed to reinterpret what they have a.s.sumed, so that their dogmatism is of short duration. Theological dogmatists are not so fortunate, because of persistence of religious tradition which has not yet been put fully to the laboratory test.

Some of them are continuously and hopelessly dogmatic. They still adhere to belief founded on the emotions which they refuse to put to scientific test. Science makes no attempt to undermine religion, but is unconsciously laying a broader foundation on which religion may stand. Theologians who are beginning to realize this are forced to re-examine the Bible and reinterpret it according to the knowledge and enlightenment of the time. Thus science becomes a force to advance Christianity, not to destroy it.

On the other hand, science becomes less dogmatic as it applies its own methods to religion and humanity and recognizes that there is a great world of spiritual truth which cannot be determined by experiments in the physical laboratory. It can be estimated only in the laboratory of human action. Faith, love, virtue, and spiritual vision cannot be explained by physical and chemical reactions. If in the past science has rightly pursued its course of investigation regardless of spiritual truth, the future is full of promise that religion and human reactions and science will eventually work together in the pursuit of {469} truth in G.o.d's great workshop. The unity of truth will be thus realized.

The area of knowledge will be enlarged while the horizon of the unknown will be extended. The mystery of life still remains unsolved.

Galton followed along in the study of the development of race and culture, and brought in a new study of human life. Pasteur and Lister worked out their great factors of preventive medicine and health.

Madame Curie developed the radioactivity as a great contribution to the evolution of science. All of this represents the slow evolution of science, each new discovery quickening the thought of the age in which it occurred, changing the att.i.tude of the mind toward nature and life, and contributing to human comfort and human welfare. But the greatest accomplishment always in the development of science is its effect on the mental processes of humanity, stimulating thought and changing the att.i.tude of mind toward life.

_Science and War_.--It is a travesty on human progress, a social paradox, that war and science go hand in hand. On one side are all of the machines of destruction, the battleships, bombing-planes, huge guns, high explosives, and poisonous gases, products of scientific experiment and inventive genius, and on the other ambulances, hospitals, medical and surgical care, with the uses of all medical discoveries. The one seeks destruction, the other seeks to allay suffering; one force destroys life, the other saves it. And yet they march forth under the same flag to conquer the enemy. It is like the conquest of the American Indians by the Spaniards, in which the warrior bore in one hand a banner of the cross of Christ and in the other the drawn sword.

War has achieved much in forcing people into national unity, in giving freedom to the oppressed and protecting otherwise helpless people, but in the light of our ideals of peace it has never been more than a cruel necessity, and, more frequently, a grim, horrible monster. Chemistry and physics and their discoveries underlying the vast material prosperity of moderns have contributed much to the mechanical and {470} industrial arts and increased the welfare and happiness of mankind.

But when war is let loose, these same beneficent sciences are worked day and night for the rapid destruction of man. All the wealth built up in the pa.s.sing years is destroyed along with the lives of millions of people.

Out of the gloom of the picture proceeds one ray of beneficent light, that of the service rendered by the discoveries of medical science and surgical art. The discoveries arising from the study of anatomy, physiology, bacteriology, and neurology, with the use of anaesthetics and antiseptics in connection with surgery, have made war less horrible and suffering more endurable. Scientists like Pasteur, Lister, Koch, Morton, and many others brought forth from their laboratories the results of their study for the alleviation of suffering.

Yet it seems almost incredible that with all of the horrid experiences of war, an enterprise that no one desires, and which the great majority of the world deplore, should so long continue. Nothing but the discovery and rise of a serum that will destroy the germs of national selfishness and avarice will prevent war. Possibly it stimulates activity in invention, discovery, trade and commerce, but of what avail is it if the cycle returns again from peace to war and these products of increased activity are turned to the destruction of civilization?

Does not the world need a baptism of common sense? Some gain is being made in the changing att.i.tude of mind toward the warrior in favor of the great scientists of the world. But nothing will be a.s.sured until the hero-worship of the soldier gives way to the respect for the scholar, and ideals of truth and right become mightier than the sword.

_Scientific Progress Is c.u.mulative_.--One discovery leads to another, one invention to others. It is a law of science. Science benefits the common man more than does politics or religion. It is through science that he has means of use and enjoyment of nature's progress. It is true this is on the side of materialistic culture, and it does not provide all that is needed for the completed life. Even though the scientific {471} experiments and discoveries are fundamentally more essential, the common man cannot get along without social order, politics, or religion.

Perhaps we can get the largest expression of the value of science to man through a consideration of the inventions and discoveries which he may use in every-day life.[6] Prior to the nineteenth century we have to record the following important inventions: alphabetic writing, Arabic numbers, mariner's compa.s.s, printing, the telescope, the barometer and thermometer, and the steam-engine. In the nineteenth century we have to record: railroads, steam navigation, the telegraph, the telephone, friction matches, gas lighting, electrical lighting, photography, the phonograph, electrical transmission of power, Rontgen rays, spectrum a.n.a.lysis, anaesthetics, antiseptic surgery, the airplane, gasoline-engine, transmission of news by radio, and transportation by automobile. Also we shall find in the nineteenth century thirteen important theoretical discoveries as compared with seven in all previous centuries.

It is interesting to note what may have taken place also in the last generation. A man who was born in the middle of the last century might reflect on a good many things that have taken place. Scientifically he has lived to see the development of electricity from a mere academic pursuit to a tremendous force of civilization. Chemistry, although supposed to have been a completed science, was scarcely begun. Herbert Spencer's _Synthetic Philosophy_ and Darwin's _Origin of the Species_ had not yet been published. Huxley and Tyndall, the great experimental scientists, had not published their great works. Transportation with a few slow steam-propelled vessels crossing the ocean preceded the era of the great floating palaces. The era of railroad-building had only just started in America. Horseless carriages propelled by gas or electricity were in a state of conjecture. Politically in America the Civil War had not been fought or the Const.i.tution really completed.

The great wealth and stupendous business organization of {472} to-day were unknown in 1850. In Europe there was no German Empire, only a German Federation. The Hapsburgs were still holding forth in Austria and the Hohenzollerns in Prussia and the Romanoffs in Russia. The monarchial power of the old regime was the rule of the day. These are inst.i.tutions of the past. Civilization in America, although it had invaded the Mississippi valley, had not spread over the great Western plains nor to the Pacific coast. Tremendous changes in art and industries, in inventions and discoveries have been going on in this generation. The flying-machine, the radio, the automobile, the dirigible balloon, and, more than all, the tremendous business organization of the factories and industries of the age have given us altogether a complete revolution.

_Research Foundations_.--All modern universities carry on through instructors and advanced students many departments of scientific research. The lines of research extend through a wide range of subjects--Chemistry, Biology, Physics, Anatomy, Physiology, Medicine, Geology, Agriculture, History, Sociology, and other departments of learning. These investigations have led to the discovery of new knowledge and the extension of learning to mankind. Outside of colleges and universities there have been established many foundations of research and many industrial laboratories.

Prominent among those in the United States are The Carnegie Corporation and The Rockefeller Foundation, which are devoting hundreds of millions of dollars to the service of research, for the purpose of advancing science and directly benefiting humankind. The results play an important part in the protection and daily welfare of mankind. The Mellon Inst.i.tute contributes much to the solution of problems of applied chemistry.[7] It is interesting to note how the investigation carried on by these and other foundations is contributing directly to human welfare by mastering disease. The elimination of the hookworm disease, the fight to control malaria, the {473} mastery of yellow fever, the promotion of public health, and the study of medicine, the courageous attack on tuberculosis, and the suppression of typhoid fever, all are for the benefit of the public. The war on disease and the promotion of public health by preventive measures have lowered the death-rate and lengthened the period of life.

_The Trend of Scientific Investigations_.--While research is carried on in many lines, with many different objectives, it may be stated that intense study is devoted to the nature of matter and the direct connection of it with elemental forces. The theories of the molecule and the atom are still working hypotheses, but the investigator has gone further and disintegrated the atom, showing it to be a complex of corpuscles or particles. Scientists talk of electrons and protons as the two elemental forces and of the mechanics of the atom. In chemistry, investigation follows the problems of applied chemistry, while organic chemistry or biochemistry opens continually new fields of research. It appears that biology and chemistry are becoming more closely allied as researches continue and likewise physics and chemistry. In the field of surgery the X-ray is in daily use, and radium and radioactivity may yet be great aids to medicine. In medical investigation much is dependent upon the discoveries in neurology.

This also will throw light upon the studies in psychology, for the relation of nerve functions to mind functions may be more clearly defined.

Explorations of the earth and of the heavens continually add new knowledge of the extent and creation of the universe. The study of anthropology and archaeology throw new light upon the origin and early history of man. Experimental study of animals, food, soils, and crops adds increased means of sustenance for the race. Recent investigations of scientific education, along with psychology, are throwing much light on mental conditions and progress. And more recently serious inquiry into social life through the study of the social sciences is revealing the great problems of life. All of knowledge, all of science, and all of human invention which add to material {474} comforts will be of no avail unless men can learn to live together harmoniously and justly.

But the truths discovered in each department of investigation are all closely related. Truly there is but one science with many divisions, one universe with many parts, and though man is a small particle of the great cosmos, it is his life and welfare that are at the centres of all achievements.

SUBJECTS FOR FURTHER STUDY