 In this (new) discussion of the nature of human knowledge, Burley distinguishes between complex cognition (notitia complexa) and simple cognition (notitia incomplexa) (cf. fols. 5va–b), as well as between two different types of exhaustive complex cognition (notitia perfecta complexa): (i) absolute (simpliciter) and (ii) relative to the general kind of thing in question (in genere) (see fols. 5vb–6ra). He also distinguishes between appropriate (distincta) (or perfectly appropriate—distinctissima) cognition and discrete or discriminative cognition (distinctive seu discretiva) (cf. fols. 10vb–11ra). A complex cognition of a thing is contained in and manifested by one or more statements about it, both affirmative and negative (fol. 5va). A simple cognition, on the other hand, is contained in and manifested by simple concepts and expressions, namely terms (fol. 5vb). Complex exhaustive cognition simpliciter is what enables us to know all the intrinsic constitutive principles of a thing along with all the essential predicates and characteristic features (propria) associated with these principles themselves. Relative exhaustive complex cognition is what makes possible for us to know all the essential predicates and all the characteristic features associated with them in relation only to the natural species (or type) of a thing (fol. 6ra). We have an appropriate cognition of a thing when we are able to list most of its constitutive elements, and a perfectly appropriate knowledge when we can specify all of its constituent elements (fol. 10vb). Finally, we have discriminative knowledge of a thing when we are able to distinguish the thing at issue from other similar things by virtue of one or more peculiar aspects which make it different from all others of the same kind (fol. 11ra).