  Suárez deals with categories in some detail in Disputation 39 of the Metaphysical Disputations (henceforth DM), although he also makes pertinent comments about them elsewhere (for example, in DE q. 75, a. 1, d. 47, s. 1, n. 4; 1861 vol. 21, p. 45a). In Metaphysical Disputation 39, he is primarily concerned with the division of accidents into nine highest genera, and the discussion of categories is incidental and indirect, rather than deliberate and explicit. Nonetheless, it is clear that Suárez is concerned with the ontological status of categories in this text.  Indeed, he explicitly adopts a certain language in order to clarify and resolve the issue.