Although categorial items are not extra-mental things, Chatton mentions classes of categorial things, suggesting there are things in categories and genera. He explains that an individual (individuum), an extra-mental thing, is in a category if the species concept that signifies it can be essentially predicated by all the genus concepts within its categorial line (Lectura I, d. 8, q. 1, a. 1, paragraph 93). Socrates is in the category of substance, in a manner of speaking, because substance, body, organism, and animal are all essentially predicable of human being and human being is essentially predicable of the individual concept Socrates or this human being, pointing to Socrates.