Chapter 23

Difference and species have this in common: that they are participated in equally, and that they are always present in the things which participated in them. Distinguishing peculiarities of difference and species are these: that the difference is predicated of what sort something is, and the species of its difference; that the difference contains several species and their individuals, whereas the species contains only the individuals which come under itself; that the difference is prior by nature to the species; and that a difference may be combined with a difference, but a species with a species never.

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