Diogenes, that infants are nurtured in the matrix inanimate, yet they have a natural heat; but presently, when the infant is cast into the open air, its heat brings air into the lungs, and so it becomes an animal.

Herophilus acknowledgeth that a natural, but not an animal motion, and that the nerves are the cause of that motion; that then they become animals, when being first born they suck in something of the air..