Abstract
Aristotle's reasoning in Z, 10-11 has three stages. In the first, Aristotle proposes two different definitions for our consideration. The definitions contrast, at least superficially, for one appears to elucidate a whole by reference to its material parts, while the other does not appear to do so. Aristotle then in effect shows that the form of a whole can be taken in three somewhat different ways: We may be concerned with form by itself, or with the essential determinacy which is form-having- its-formal-effect-in-a-milieu; in the latter alternative, the essential determinacy may be so taken as to be particular or as to be typical. In each of the three cases, form as the primary intelligible is the governing factor. On this basis, it is possible to clarify the character of the two definitions originally proposed as suggestive of a difficulty.