 As far as the nature of qualia and their relation to quality are concerned, Burley thinks that qualia are aggregates composed of a substance and a quality inhering in it. They do not belong to any categorial field because they lack in real unity. Nevertheless, since they are qualia in virtue of a qualitative form, they can be included in the category of quality indirectly (per reductionem—EP, ch. de qualitate, fol. 41rb). Qualia share qualities to different degrees. While no qualitative form admits of more or less, their substrates of inherence do (EP, ch. de qualitate, fol. 41vb). In this way, Burley advances two important theses of his metaphysics as logical corollaries of his theories of universals and substances: (1) no universal form can be shared in different degrees by the individual instantiating it; (2) no individual form can be subject to change, except, of course, through generation and corruption.