GENERATION OF ANIMALS, V. viii. 



supposing that when water has been drawn off from 

 a dropsical patient the reason for which it has been 

 done is the lancet, and not the patient's health, ybr 

 the sake of jrhich the lancet made the incision. 



We have now dealt with the subject of the teeth, 

 and we have stated why some of them are shed and 

 grow a second time and why some of them do not, 

 and generally, to what cause their being formed is 

 due. We have also dealt \\-ith the other conditions 

 which affect the parts of the body, conditions which 

 occur not for the sake of any Final Cause but of 

 necessity and on account of the Motive Cause. 



561 



