QUESTIONS ABOUT MOVEMENT.
What further proves that movement is a genus, is that it is very difficult, if not impossible, to grasp it by a definition. But how can it be called a form when its result is deterioration, or something passive? It may then be compared to the warming influence of the rays of the sun, which exerts on some things an influence that makes them grow, while other things it shrivels. In both cases, the movement has something in common, and is identical, so far as it is a movement; the difference of its results is due to the difference of the beings in which it operates. Are then growing sick and convalescence identical? Yes, so far as they are movements. Is their difference then due to their subjects, or to anything else? This question we will consider further on, while studying alteration. Now let us examine the elements common to all movements; in that way we shall be able to prove that movement is a genus.