PHILOSOPHY AND SCIENCE Bertrand Russell Philosophy has had from its earliest days two different objects which were believed to be closely interrelated. On the one hand, it aimed at a theoretical understand ing of the structure of the world; on the other hand, it tried to discover and inculcate the best possible way of life. From Heraclitus to Hegel, or even to Marx, it consistently kept both ends in view, it was neither purely theoretical nor purely practical, but sought a theory of the universe upon which to base a practical ethic Philosophy has thus been closely related to science on the one hand, and to religion on the other. Let us consider first the relation to science. Until the eighteenth century science was included in what was commonly called"philosophy, but since that time the word "philosophy"has been confined, on it's theoretical side, to what is most speculative and general in the topics with which science deals. It is often said that philosophy is unprogressive, but this is largely a verbal matter: as soon as a way is found of arriv ing at definite knowledge on some ancient question, the new knowledge is counted as belonging to"science, and"philosophy"is deprived of the credit. In Greek times, and down to the time of Newton, planetary theory belonged to philosophy, because it was uncertain and speculative, but Newton took the subject It of the realm of the free play of hypothesis, and made it one requiring a different type of skill from that which it had required when it was still open to fundamental doubts. Anaximander, in the sixth century B. C, had a theory of evolution, and maintained that men are descended from fishes. This was philosophy because it was a speculation unsupported by detailed evidence, but Darwin,s theory of evolution was science because it was based on the succession of forms of life as found in fossils and upon the distribution of animals and plants in many parts of the world. a man might say, with enough truth to justify a joke "Science is what we know, and philosophy is what we don't know. But it should be added that philosophical speculation as to what we do not yet know has shown itself a valuable preliminary to exact scientific knowledge. The guesses of the Pythagoreans in astronomy, of Anaximander and Empedocles in biological evolution, and of Democritus as to the atomic constitution of matter, provided the men of Science in later times with hypotheses which, but for the philosophers, might never have entered their heads. We may say that, on its theoretical side, philosophy consists, at least in part, in the framing of Large general hypotheses which science is not yet in a position to test; but when it becomes possible to test the hypotheses they become, if verified, a part of science, and cease to count as"philosophy The util ity of philosophy, on the theoretical side, is not confined to speculations which we may hope to see confirmed or confuted by science within a measurable time Some men are so impressed by what science knows that they forget what it does notPHILOSOPHY AND SCIENCE Bertrand Russell Philosophy has had from its earliest days two different objects which were believed to be closely interrelated. On the one hand, it aimed at a theoretical understanding of the structure of the world; on the other hand, it tried to discover and inculcate the best possible way of life. From Heraclitus to Hege1, or even to Marx, it consistent1y kept both ends in view; it was neither purely theoretical nor purely practical, but sought a theory of the universe upon which to base a practical ethic. Philosophy has thus been closely related to science on the one hand, and to religion on the other. Let us consider first the relation to science. Until the eighteenth century science was included in what was commonly called "philosophy," but since that time the word "phi1osophy" has been confined, on it's theoretical side, to what is most speculative and general in the topics with which science deals. It is often said that philosophy is unprogressive, but this is largely a verbal matter: as soon as a way is found of arriving at definite knowledge on some ancient question, the new knowledge is counted as belonging to "science," and "philosophy" is deprived of the credit. In Greek times, and down to the time of Newton, planetary theory belonged to "philosophy," because it was uncertain and speculative, but Newton took the subject out of the realm of the free p1ay of hypothesis, and made it one requiring a different type of skill from that which it had required when it was still open to fundamental doubts. Anaximander, in the sixth century B.C., had a theory of evolution, and maintained that men are descended from fishes. This was philosophy because it was a speculation unsupported by detai1ed evidence, but Darwin's theory of evolution was science, because it was based on the succession of forms of life as found in fossils, and upon the distribution of animals and plants in many parts of the world. A man might say, with enough truth to justify a joke "Science is what we know, and philosophy is what we don't know.” But it should be added that philosophical speculation as to what we do not yet know has shown itself a valuable preliminary to exact scientific knowledge. The guesses of the Pythagoreans in astronomy, of Anaximander and Empedocles in biological evolution, and of Democritus as to the atomic constitution of matter, provided the men of Science in later times with hypotheses which, but for the philosophers, might never have entered their heads. We may say that, on its theoretical side, philosophy consists, at least in part, in the framing of Large general hypotheses which science is not yet in a position to test; but when it becomes possib1e to test the hypotheses they become, if verified, a part of science, and cease to count as "philosophy." The utility of philosophy, on the theoretical side, is not confined to speculations which we may hope to see confirmed or confuted by science within a measurable time. Some men are so impressed by what science knows that they forget what it does not