. GENERATION OF ANIMALS, II. iv.-v. 



principle of movement. Now the products which are 

 formed by human art are formed by means of instru- 

 ments, or rather it would be truer to say they are 

 formed by means of the movement of the instruments, 

 and this movement is the activity, the actualization, 

 of the art, for by " art " we mean the shape of the 

 products which are formed, though it is resident 

 elsewhere than in the products themselves." The 

 dynamis of the nutritive Soul behaves in the same 

 way. Just as, in the independently existing animal 

 or plant, this Soul, which uses heat and cold as its 

 instruments (for it is in these that its movement sub- 

 sists,'' each several thing being formed according to 

 some definite logos), at a later stage produces gro\\"th 

 out of the nourishment suppUed, so in precisely the 

 same way at the very outset, this Soul, while the 

 natural object is being formed, causes it to be set and 

 constituted ; since, as the matter from which the ob- 

 ject derives its growth is identical \nih that out of 

 which it was originally set and constituted, so too 

 the dynamis which fashions the object is identical. 

 If, then, this is the nutritive Soul, this it is which 

 also generates the object. And this part of Soul 

 it is which is the " nature " of each several object,'' 

 being present alike in plants and in animals one and 

 all, whereas the other parts of Soul,'' while present 

 in some living things, are absent from others. 



Now in plants the female is not separate from (o) why the 

 the male ; in certain of the animals, however, it is '^^^Jf^ 

 separate, and here, in addition, it has need of the generate 

 male. And yet anyone might well raise the puzzle, y°°®" 



ex€t OLpyriv, and De caelo 301 b 17 <f>vais /xev iariv tj ev ainCo 

 VTTapxovoa Kivi^aews apx'?* See also Introd. § 42. 

 •* See Introd. § 43. 



201 



