scious of its own consciousness, until its attitude shall have embraced in its object the very principle of attitudes. Philosophy defines itself and all other human tasks and interests. None have furnished a clearer justification of philosophy than those men of scientific predilections who have claimed the title of agnostics. A good instance is furnished by a contemporary physicist, who has chosen to call his reflections "antimetaphysical."

"Physical science does not pretend to be a complete view of the world; it simply claims that it is working toward such a complete view in the future. The highest philosophy of the scientific investigator is precisely this toleration of an incomplete conception of the world and the preference for it, rather than an apparently perfect, but inadequate conception."1

It is apparent that if one were to challenge such a statement, the issue raised would at once be philosophical and not scientific. The problem here stated and answered, requires for its solution the widest inclusiveness of view, and a peculiar interest in critical reflection and logical coördination.

§ 41. One may be prepared for a knowledge of

'Ernst Mach: Science of Mechanics. Translation by McCormack, p. 464. No one has made more important contributions than Professor Mach to a certain definite modern philosophical movement. Cf. § 207.

of a Philoso

the economic and social significance of the railway The Procedure even if one does not know a throttle phy of Science. from a piston-rod, provided one has broad and well-balanced knowledge of the interplay of human social interests. One's proficiency here requires one to stand off from society, and to obtain a perspective that shall be as little distorted as possible. The reflection of the philosopher of science requires a similar quality of perspective. All knowledges, together with the knowing of them, must be his object yonder, standing apart in its wholeness and symmetry. Philosophy is the least dogmatic, the most empirical, of all disciplines, since it is the only investigation that can permit itself to be forgetful of nothing.

But the most comprehensive view may be the most distorted and false. The true order of knowledge is the difficult task of logical analysis, requiring as its chief essential some determination of the scope of the working conceptions of the different independent branches of knowledge. In the case of natural science this would mean an examination of the method and results characteristic of this field, for the sake of defining the kind of truth which attaches to the laws which are being gradually formulated. But one must immediately

reach either the one or the other of two very general conclusions. If the laws of natural science cover all possible knowledge of reality, then there is left to philosophy only the logical function of justifying this statement. Logic and natural science will then constitute the sum of knowledge. If, on the other hand, it be found that the aim of natural science is such as to exclude certain aspects of reality, then philosophy will not be restricted to logical criticism, but will have a cognitive field of its own. The great majority of philosophers have assumed the latter of these alternatives to be true, while most aggressive scientists have intended the former in their somewhat blind attacks upon 66 metaphysics." Although the selection of either of these alternatives involves us in the defence of a specific answer to a philosophical question, the issue is inevitable in any introduction to philosophy because of its bearing upon the extent of the field of that study. Furthermore there can be no better exposition of the meaning of philosophy of science than an illustration of its exercise. The following, then, is to be regarded as on the one hand a tentative refutation of positivism, or the claim of natural science to be coextensive with knowable reality; and on the

other hand a programme for the procedure of philosophy with reference to natural science.

the Scientific

Interest.

§ 42. Science issues through imperceptible stages from organic habits and instincts which The Origin of signify the possession by living creatures of a power to meet the environment on its own terms. Every organism possesses such a working knowledge of nature, and among men the first science consists in those habitual adjustments common to men and infra-human organisms. Man is already practising science before he recognizes it. As skill it distinguishes itself early in his history from lore, or untested tradition. Skill is familiarity with general kinds of events, together with ability to identify an individual with reference to a kind, and so be prepared for the outcome. Thus man is inwardly prepared for the alternation of day and night, and the periods of the seasons. He practically anticipates the procession of natural events in the countless emergencies of his daily life. But science in the stricter sense begins when skill becomes free and social.

843. Skill may be said to be free when the essential terms of the action have been abstracted from the circumstances attending them in individ

ual experiences, and are retained as ideal plans apSkill as Free. plicable to any practical occasion. The monkey who swings with a trapeze from his perch on the side of the cage, counts upon swinging back again without any further effort on his own part. His act and its successful issue signify his practical familiarity with the natural motions of bodies. We can conceive such a performance to be accompanied by an almost entire failure to grasp its essentials. It would then be necessary for nearly the whole situation to be repeated in order to induce in the monkey the same action and expectation. He would require a similar form, color, and dis

tance.

But he might, on the other hand, regard as practically identical all suspended and freely swinging bodies capable of affording him support, and quite independently of their shape, size, time, or place. In this latter case his skill would be applicable to the widest possible number of cases that could present themselves. Having a discerning eye for essentials, he would lose no chance of a swing through looking for more than the bare necessities. When the physicist describes the pendulum in terms of a formula such as t=2π/g he exhibits a similar discernment. He has found that the time occupied by an oscillation of any pen