ABSTRACT
From Aristotle’s point of view, biology and psychology are not two separate sciences. His psychological and biological works form a single group, which he might perhaps have divided as follows. The Historia Animalium is a preliminary work which aims at recording the main facts of animal life. The remaining treatises aim at eliciting theory from the recorded facts. The theory deals partly with the matter of living things (De Partibus Animalium, De Incessu Animalium), partly with their essential form (De Anima), partly with their consequential properties (Parva Naturalia, De Motu Animalium, De Generatione Animalium). But in view of the subsequent development of the sciences it will be convenient to treat his biology and his psychology separately.
