The sciences started out with unconfirmed guesses based on not very accurate information. As man's methods became more precise, he controlled the conditions under which observations were made, and the conditions under which generalizations were drawn from them. The control of the conditions and methods of observation constitute what is known as induction in science. To this phase of the reflective process belong all the instruments for precise observation which characterize the scientific laboratory. The control of the methods by which generalizations or theories are built up from these facts is also part of the logic of induction, and includes all the canons and regulations for inductive inference.
But generalizations once made must be tested, and the elaboration of these generalizations, the analysis of them into their precise bearings, constitute that part of the process of reasoning known as deduction. The final verification is again inductive, an experimental corroboration of theories by the facts already at hand and by facts additionally sought out and observed.
(These processes will be discussed in detail in the chapter on "Science and Scientific Method.")
However complicated the process of inquiry may become, the sciences remain essentially man's mode of satisfying his disinterested curiosity about the world in which he is living. Through the sciences man makes himself, as has been so often said, at home in the world. He substitutes for the "blooming, buzzing confusion" which is the world as he first knows it, order, system, and law. Primitive man, absurd as seems to us his belief in a world of magic, of malicious demons and capricious gods, was trying to make sense out of the meaningless medley in which he seemed to find himself. Through science, modern man is likewise trying to make sense out of his world. The more apparently disconnected and incongruous facts that can be brought within the compass of simple and perfectly regular law, the less threatening or capricious seems the world in which we live. Where everything that happens is part of a system, we do not need, like the savage trembling in a thunderstorm, to be frightened at what will happen next. It is like moving in familiar surroundings among familiar people. Not all that goes on may be pleasant, but we can within limits predict what will happen, and are not puzzled and pained by continuous shocks and surprises. We like order in the places in which we live, in our homes, in our cities, in the universe.
The sciences satisfy us not only in that they bring order into what at first seems the chaos of our surroundings, but in that they are themselves beautiful in their spaciousness and their simplicity. We cannot pause here to consider the physiological facts which make us admire symmetry, but it is fundamental in our appreciation of music, poetry, and the plastic arts. From the sciences, likewise, we derive the satisfaction of symmetry on a magnificent scale. There is beauty as of a great symphony in the sweep and movement of the solar system. There is a quiet and infinite splendor about the changeless and comparatively simple structure which physics, in the broadest sense, reveals beneath the seeming multiplicity and variety of things. It is a desire for beauty as well as a thoroughgoing scientific passion which prompts men like Poincaré and Karl Pearson to seek for one law, one formula which, like "one clear chord to reach the ears of God," expresses the whole universe.
The practical aspect of science. But while the origins of science may lie in man's thirst for system, simplicity, and beauty in the world, the tremendous advance of science has a more immediate and practical cause. To understand the laws of Nature means to have the power of prediction; it means to know that, given certain circumstances, certain others follow always and inevitably; it means to discover causes—and their effects. Man having attained through patient inquiry this capacity to tell in advance, may take advantage of it for his own good. The whole of modern industry with its phenomenal control of natural powers and resources is testimony to the use which man has found for the facts and laws which he would never have found out save for the curiosity which was his endowment and the inquiry which he made his habit. "Knowledge is power," said Francis Bacon, and the three hundred years of science that have made possible the whole modern world of electric transportation, air travel between two continents, and instantaneous communication between remote parts of the world, have proved the aphorism. Man since his origin has tried to control his environment for his own good. The cave and the flint were his first rude attempts. In science with its accurate observation of facts not apparent to the unaided eye, and its discovery and demonstration of laws not found by casual and unsystematic common sense, man has an incomparably more refined instrument, and an incomparably more effective one. Thus, paradoxically enough, man's most disinterested and impartial activity is at the same time his most practical asset.
The creation of beautiful objects and the expression of ideas and feelings in beautiful form. Most men spend most of their lives necessarily in practical activity. Man's particular equipment of instincts survived in "the struggle for existence" precisely because they were practical, because they did help the human creature to maintain his equilibrium in a half-friendly, half-hostile environment. Man acquires also, as already has been pointed out, habits that are useful to him, that bring him satisfactions not attainable through the random instinctive responses which are his at birth. Reflection, too, is, for the most part, severely practical in its origins and its responsibilities. It guides action into economical and useful channels.
Most of man's actions are thus ways of modifying his environment for immediately practical purposes. Man has instincts and habits which enable him to live. But in making those changes in the world which enable him to live better, man, as it were by accident, makes them beautifully. Pottery begins, for example, as a practical art, but the skilled potter cannot help spending a little excess vitality and habitual skill in adding a quite unnecessarily graceful curve, a gratuitous decoration to the utilitarian vessel he is making. In the words of Santayana, "What had to be done was, by imaginative races, done imaginatively; what had to be spoken or made was spoken or made fitly, lovingly, beautifully.... The ceaseless experimentation and fermentation of ideas, in breeding what it had a propensity to breed, came sometimes on figments that gave it delightful pause."[1]
[Footnote 1: Santayana: Reason in Art, p. 16.]
These accidental graces that man makes in the instinctive and habitual control to which he subjects his environment become the most cherished values of his experience. Men may first have come to speak poetry accidentally, for language arose, like other human habits, as a thing of use. But the charming and delightful expression of feelings and ideas came to be cherished in themselves, so that what was first an accident in man's life, may become a deliberate practice. When this creation of beautiful objects, or the beautiful expression of feelings or ideas is intentional, we call it art. In such intentional creation and cherishing of the beautiful man's life becomes enriched and emancipated. He learns not only to live, but to live beautifully.