Note 20 — Chapter I · THE LOWER FORMS OF ABSTRACTION.
Frances A. (Frances Alice) Welby translation
Three Introductory Lectures on the Science of Thought, delivered at the Royal Institution, appendix, p. 6, letter 4; Chicago, 1888. It should, however, be remembered that the writer who thus uses the logic of images has a mind preformed by the logic of signs: which is not the case with animals.