I discuss some of Aristotle’s scattered remarks from which one can construct his conception of matter. Aristotle seems to oscillate between two conceptions: one in which matter is the principle of becoming, another in which matter is a constituent element with no contribution for processes of becoming. Sometimes Aristotle takes matter as a thing independent in itself, and the correlated form is a feature that does not contribute to the matter’s essence, nor is a necessary condition for its existence. But (...) sometimes Aristotle takes matter as a constituent element the existence of which depends on the whole thing it is the matter of. These different approaches to matter seem to suggest an inconsistent theory of matter. However, I argue that, quite to the contrary, Aristotle has a consistent theory about matter. One of my main points is to distinguish contexts in which Aristotle is indeed talking about matter in general from contexts in which he uses the term “matter” to refer to a given thing that was previously taken as matter and to talk about that thing not qua matter, but qua the thing it is. (shrink)

Recent studies of Aristotle’s meteorology have often focused on questions of scientific methodology rather than on the empirical accuracy of the explanations. Here we wish to focus on Aristotle’s theory of storms, considering them in their historical context and in light of Aristotle’s theoretical commitments, but testing them in terms of their ability to explain the phenomena in question. Aristotle’s approach to storm events follows a general pattern of “outburst” theories proposed by Presocratic thinkers, in which wind, fire, and the (...) like burst out of clouds. Aristotle proposes a two-exhalation theory in which a dry and a moist gas arise by evaporation and can conflict with each other. In Meteorologica II.9 and III.1, he provides his own theory of storms. Modern accounts are hampered by a mistranslation of ‘eknephias’ as “hurricane.” We argue that an eknephias is never a hurricane, but in the first place a theoretical construct meant to account for three distinct phenomena: tuphōn, keraunos, and prēstēr, all of which need to be identified more clearly with actual meteorological phenomena than they have been. We identify appropriate phenomena and also propose a phenomenon corresponding to eknephias, which makes sense of Aristotle’s account. (shrink)

Thomas Aquinas describes embryological development as a succession of vital principles, souls, or substantial forms of which the last places the developing being in its own species. In the case of human beings this form is the rational soul. Aquinas' well-known commitment to the view that there is only one substantial form for each composite and that a substantial form directly informs prime matter leads to the conclusion that the succession of soul kinds is non-cumulative. The problem is that this (...) view seems to entail discontinuity in the process of generation. Aquinas argues for the continuity of a conceived being by appealing to the teleological argument at the core of Aristotle's embryogenesis theory: according to Aristotle, embryonic development is a gradual actualization of the form of the species, potentially present in the embryo from the outset. Aquinas denies such a gradualist account due to his metaphysical commitments , arguing instead that the .. (shrink)

The current debate over Aristotle's commitment to prime matter is centered on diachronic considerations found in his theory of substantial change. I argue that an appeal to this theory is not required in order to establish his commitment to the existence of prime matter. By drawing on Physics II.1's conception of what it is for an element to have a nature - that is, to have an inner source of movement and rest - I introduce a synchronic justification for the (...) existence of prime matter. By trading on the relationship between the thing that has a source of change and the source it has , I show that something that has a source in itself cannot be identical with its source, and that a type of matter that has no nature of its own (a kind of prime matter) is required to block this identification at the level of the elements. (shrink)