ON GENERATION. 327 



existence with the punctum saliens, and at the same time, seems 

 to be as well a part of the chick, and a kind of efficient or 

 instrument of its generation, inseparable, as Fabricius thinks, 

 from the agent. But how the egg may be called the efficient 

 and instrument of generation, has partly been explained already, 

 and will be illustrated more copiously by what we shall presently 

 say. 



So much has been fully established in our history, that 

 the punctum pulsans and the blood, in the course of their 

 growth, attach round themselves the rest of the body, and all 

 the other members of the chick, just as the yelk in the uterus, 

 after being evolved from the ovary, surrounds itself with the 

 Avhite ; and this not without concoction and nutrition. Now 

 the common instrument of all vegetative operations, is, in the 

 opinion of all men, an internal heat or calidum innatum, or 

 a spirit diffused through the whole, and in that spirit a soul 

 or faculty of a soul. The egg, therefore, beyond all doubt, 

 has its own operative soul, which is all in the whole, and all 

 in each individual part, and contains within itself a spirit or 

 animal heat, the immediate instrument of that soul. To one 

 who should ask then, how the chick is made from the egg, we 

 answer : after all the ways recited by Aristotle, and devised 

 by others, in which it is possible for one thing to be made 

 from another. 



EXERCISE THE FORTY-FOURTH. 



Fabricius is mistaken with regard to the matter of the generation 

 of the chick in ovo. 



As I proposed to myself at the outset, I continue to follow 

 Fabricius as pointing out the way; and we shall, therefore, 

 consider the three things which he says are to be particularly 

 regarded in the generation of the chick, viz. : the agent, the 

 matter, and the nourishment of the embryo. These must 

 needs be all contained in the egg ; he proposes various 

 doubts or questions, and quotes the opinions of the most 

 weighty authorities in regard to them, these opinions being 



