The audacity of my enterprise really consists in my attempting to act according to this general truth in a particular case — the case, that is, of the phenomena of animal life. I have gone on the assumption that knowledge of animal chemistry, for example, at one extreme, and of human consciousness at the other, would be simple blanks as to meaning but for the relation of the two knowledges to each other and to still more general knowledge of animal life.

Could we imagine a chimpanzee poss...