Note 26 — Chapter VII · ANALYTICA POSTERIORA I.

Ibid. vii. p. 75, a. 38-b. 20. Mr. Poste, in his translation, here cites (p. 50) a good illustrative passage from Dr. Whewell’s Philosophy of the Inductive Sciences, Book II. ii.:— “But, in order that we may make any real advance in the discovery of truth, our ideas must not only be clear; they must also be appropriate. Each science has for its basis a different class of ideas; and the steps which constitute the progress of one science can never be made by employing the ideas of another kind of science. No genuine advance could ever be obtained in Mechanics by applying to the subject the ideas of space and time merely; no advance in Chemistry by the use of mere mechanical conceptions; no discovery in Physiology by referring facts to mere chemical and mechanical principles.” &c.