 Each of these species looks like an extra-linguistic type of entity, and none of the species appears to be a species in another category. Hence, any difficulties with Aristotle’s treatment of quality concern the appropriateness of the divisions he makes rather than the extent to which the category fits into a larger interpretation of the categorial scheme. But, as with just about everything in Aristotle’s scheme, the divisions he makes among qualities have been severely criticized. J.L. Ackrill, for instance, criticizes Aristotle as follows: