Aristotle: On Generation and Corruption

This essay considers three case studies of Aristotle’s use of matter, drawn from three different scientific contexts: menstrual fluid as the matter of animal generation in the Generation of Animals, the living body as matter of an organism in Aristotle’s On the Soul (De Anima), and the matter of elemental transformation in Generation and Corruption. I argue that Aristotle conceives of matter differently in these treatises (1) because of the different sorts of changes under consideration, and (2) because sometimes he (...) is considering the matter for one specific change, and sometimes the matter for all of a thing’s natural changes. My account allows me to explain some of the strange features that Aristotle ascribes to the matter for elemental transformation in Generation and Corruption II. These features were interpreted by later commentators as general features of all matter. I argue that they are a result of the specific way that Aristotle thinks about the transmutation of the elements. (shrink)

This contribution offers an interpretation of the last half of chapter 1 of book 5 of Aristotle’s Physics in the form of a commentary. Among other things, it attempts an explanation of why Aristotle calls the termini of changes ‘something underlying’ (ὑποκείμενον) and ‘something not underlying’ (μὴ ὑποκείμενον). It also provides an analysis of Aristotle’s argument for the claim that what is not simpliciter does not change in the light of this interpretation.

In Physics 4.11, Aristotle says that changes are continuous because magnitude is continuous. I suggest that this is not Aristotle’s considered view, and that in Generation and Corruption 2.10 Aristotle argues that this leads to the unacceptable consequence that alterations can occur discontinuously. Physics 6.4 was written to amend this theory, and to argue that changes are continuous because changing bodies are so. I also discuss the question of Aristotle’s consistency on the possibility of discontinuous alterations, such as freezing.

In On Generation and Corruption 1. 10 and 2. 7 Aristotle discusses mixing and mixtures. Recent scholars tend to read the two texts together, thus treating the production of homoeomers in GC 2. 7 as a process of mixing the material elements. I argue that the tendency to treat homoeomers as mixtures of material elements is incorrect: GC 1. 10 explains the mixing of bodies that have already been produced from the elements, whereas GC 2. 7 explains the processes that (...) produce compound bodies from simpler constituents. In GC 2. 7 only the primary contraries mix in the formation of a homoeomer: material elements cannot be constituents of mixtures for theoretical and physical reasons. This makes sense of the production of homoeomers in GC 2. 7 despite worries about mixing the material elements. For Aristotle, the production of homoeomers is simultaneously a process of mixing the primary contraries and generating the homoeomers from the destruction of material elements. (shrink)

The difficulties often attributed to prime matter hold for all hylomorphic accounts of substantial change. If the substratum of substantial change actually persists through the change, then such change is merely another kind of accidental change. If the substratum does not persist, then substantial change is merely creation ex nihilo. Either way matter is an empty concept, explaining nothing. This conclusion follows from Aristotle’s homoeomerity principle, and attempts to evade this conclusion by relaxing the constraints Aristotle imposes on elementhood, generation, (...) and substrata all fail, and even the minimal constraints imposed by the Problem of Material Constitution are enough to generate the dilemma. -/- Aristotle resolves this dilemma in Physics I.9 by postulating pure potentiality-for-substance as the substratum of substantial change. Because the substratum persists, substantial change is not creation ex nihilo, but because it does not persist actually it is not a kind of accidental change. Aristotle uses this approach to solve the Problem of the Mixt and the Problem of Material Constitution without weakening his constraints on elementhood, generation, or substrata. This pure potentiality approach must be carefully distinguished from other ‘traditional’ or ‘prime matter’ views that posit some actuality for the substratum of substantial change, and it is best understood in light of the analogy found at Metaphysics Θ.6. Pure potentiality-for-substance can do the work needed in a substratum for substantial change because Aristotle is able to ground the identity, existence, and characterization of the substratum in the corrupting and generating substances rather than the substratum itself. (shrink)

Tomamos como texto de referencia Sobre la generación y la corrupción 2. 10 para establecer el uso de la demostración científica. Aristóteles establece los principios de la generación en GC 1 pero en adelante construye genuinas demostraciones científicas apoyándose precisamente en aquellos principios. Reconstruiremos un pasaje puntual de GC 2. 10 para defender la hipótesis del uso real de la demostración científica en los tratados científicos. La particularidad específica de este trabajo es que esta demostración científica apunta a hacer explícita, (...) dentro del marco de la cuádruple causalidad aristotélica, la causalidad eficiente del fenómeno de la generación. (shrink)

It might seem quite commonplace to say that Aristotle identifies fire, air, water and earth as the στοιχεῖα, or ‘elements’ – or, to be more precise, as the elements of bodies that are subject to generation and corruption. Yet there is a tradition of interpretation, already evident in the work of the sixth-century commentator John Philoponus and widespread, indeed prevalent, today, according to which Aristotle does not really believe that fire, air, water and earth are truly elemental. The basic premise (...) of this interpretation is that Aristotle takes fire, air, water and earth to be, in some sense, composite bodies and, as such, analysable into simpler constituents. But, of course, an element of bodies is defined by Aristotle himself as something into which bodies can be analysed, and which does not admit further analysis . So if fire, air, water and earth can be analysed into simpler or more basic constituents, then it would seem to follow that the latter ought to be considered Aristotle's true elements. These are usually identified as the primary contraries hot and cold, dry and wet; many, perhaps most, commentators would insist also upon prime matter as the subject upon which these contraries act. (shrink)

This chapter argues that it is possible to identify, in the coming to be of knowledge, the three elements that Aristotle says are involved in any kind of coming to be whatsoever (viz., matter, form, and the generated composite object). Specifically, it is argued that in this schema the passive intellect (pathetikos nous) corresponds to the matter, the active intellect (poetikos nous) corresponds to the form, and the composite object corresponds to the mind as actually knowing.