Chapter II

Definition of terms. Different kinds of _motion_. _Alteration_ or qualitative change. Refutation of the Sophists' objection that such change is only apparent, not real. The four fundamental qualities of Hippocrates (later Aristotle). Distinction between _faculty_, _activity_ (function), and _effect_ (work or product).

## Chapter III It is by virtue of the _four qualities_ that each part functions. Some authorities subordinate the dry and the moist principles to the hot and the cold. Aristotle inconsistent here.

## Chapter IV We must suppose that there are _faculties_ corresponding in number to the visible _effects_ (or products) with which we are familiar.

## Chapter V Genesis, growth, and nutrition. Genesis (embryogeny) sub-divided into histogenesis and organogenesis. Growth is a tridimensional expansion of the solid parts formed during genesis. Nutrition.

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