text: The Stoics would set ahead of this still another genus, even more primary; concerning which I shall immediately speak, after proving that the genus which has been discussed above, has rightly been placed first, being, as it is, capable of including everything. I therefore distribute "that which exists" into these two species, – things with, and things without, substance. There is no third class. And how do I distribute "substance"? By saying that it is either animate or inanimate. And how do I distribute the "animate"? By saying: "Certain things have mind, while others have only life." Or the idea may be expressed as follows: "Certain things have the power of movement, of progress, of change of position, while others are rooted in the ground; they are fed and they grow only through their roots." Again, into what species do I divide "animals"? They are either perishable or imperishable. Certain of the Stoics regard the primary genus as the "something." I shall add the reasons they give for their belief; they say: "in the order of nature some things exist, and other things do not exist. And even the things that do not exist are really part of the order of nature. What these are will readily occur to the mind, for example centaurs, giants, and all other figments of unsound reasoning, which have begun to have a definite shape, although they have no bodily consistency."