Man, it is to be noted, has community with things inanimate, and participates in the life of unreasoning creatures, and shares in the mental processes of those endowed with reason. For the bond of union between man and inanimate things is the body and its composition out of the four elements: and the bond between man and plants consists, in addition to these things, of their powers of nourishment and growth and seeding, that is, generation: and finally, over and above these links man is connected with unreasoning animals by appetite, that is anger and desire, and sense and impulsive movement.