 Among the nine genera of accidents, quantity is the most important one, as it is the basis of all further accidents, because every other accident presupposes it. Indeed, quantity orders substance for receiving quality and the other accidental forms. In his commentary on the Categories (ch. 10, § 4) and in the first part of his Summa Logicae (pars I, ch. 44) Ockham had claimed that it was superfluous to posit quantitative forms really distinct from substance and quality, since quantity presupposes what it is intended to explain, that is, the extension of material substances and their having parts outside parts. As an accident, quantity presupposes substance as its substrate of inherence. Like Burley, Wyclif also denies that material substance can be actually extended without the presence of quantitative forms in it, thereby affirming their necessity (cf. De ente praedicamentali, ch. 6, p. 50.), and consequently he tries to confute Ockham’s argumentation (ibidem, pp. 50–58). He admits that the existence of any quantity always implies that of substance, but he also believes that the actual existence of parts in a substance necessarily implies the presence of a quantitative form in it, distinct (1) from the substance (say Socrates) in which it inheres, and (2) from the truth, grounded on the substance at issue, that this same substance is a quantified thing (ibidem, pp. 51–53). He does not give us any sound metaphysical reason for this preference. Nevertheless, it is easily understandable, when considered from the point of view of his semantic presuppositions, according to which, the reality itself is the interpretative pattern of our language.