It is a commonplace of logic that both induction and deduction may be employed in many fields of science. We may attain by inductive inquiry to more or less general truths, which we no longer care to call in question, and which we accept as a "given," to be exploited and carried out in its consequences. Indeed, we need not betake ourselves to science to have an illustration of this method of procedure. In everyday life men have maxims by which they judge of the probable actions of their fellow-men and in the light of which they direct their dealings with them. Such maxims as that men may be counted upon to consult their own interests have certainly not been adopted independently of an experience of what, on particular occasions, men have shown themselves to be. But, once adopted, they may be treated as, for practical purposes, unquestionable; men are concerned to apply them, not to substantiate them. In so far, men reason from them deductively and pass from the general rule to the particular instance. 16. THE AUTHORITY OF THE "GIVEN."--Obviously the "given," in the sense indicated, may possess, in certain cases, a very high degree of authority, and, in others, a very low degree. In the case of the mathematical truth referred to above, men do not, in fact, find it necessary to call in question the "given," though they may be divided in their notions touching the general nature of mathematical evidence and whence it draws its apparently indisputable authority. In certain of the inductive sciences, as in mechanics, physics and chemistry, generalizations have been attained in which even the critical repose much confidence. In other fields men are constantly making general statements which are promptly contradicted by their fellows, and are drawing from them inferences the justice of which is in many quarters disallowed. There are axioms and axioms, maxims and maxims. The confidence felt by a given individual in a particular "given" does not guarantee its acceptance by all men of equal intelligence. Where, however, the evidence upon which a disputed "given" is based is forthcoming, there is, at least, ground for rational discussion. Not a few famous writers have treated moral truths as analogous to mathematical. [Footnote: See the chapter on "Intuitionism," Sec 90, note.] To take here a single instance. Sidgwick, in his truly admirable work on "The Methods of Ethics," maintains [Footnote: Book III, chapter xiii, Sec 3.] that "the propositions, 'I ought not to prefer a present lesser good to a future greater good,' and 'I ought not to prefer my own lesser good to the greater good of another,' do present themselves as self-evident; as much (_e.g._) as the mathematical axiom that 'if equals be added to equals the wholes are equals.'"