Aristotle 
On Sense and the Sensible [EPUB ebook] 

Having now definitely considered the soul, by itself, and its several faculties, we must next make a survey of animals and all living things, in order to ascertain what functions are peculiar, and what functions are common, to them. What has been already determined respecting the soul must be assumed throughout. The remaining parts of our subject must be now dealt with, and we may begin with those that come first.