DIFFERENT SYSTEMS. 91 



but he acknowledges, that he feparated a hen 

 from the cock for 20 days, and that all the eggs 

 fhe laid were fecundated. As long as the egg 

 remains attached to the ovarium, it is nourilhed 

 by the vefleis of the common pedicle; but, when 

 it feparates from this pedicle, it receives the 

 white liquor and the lliell from the matter with 

 which the canal of the uterus is tilled. 



The two cords [chalazae) which Aquapen- 

 dcnte confidered to be the germ, or part produ- 

 ced by the male femen, are found in unimpreg- 

 nated, as well as impregnated eggs; and Harvey 

 properly obferves, that thefe parts neither pro- 

 ceed from the male, nor receive the impregna- 

 tion. The part of the egg which receives the 

 impregnation is a fmall white circle lituated up- 

 on the membrane that covers the yolk, and has 

 the appearance of a cicatrice about the fize of a 

 lentil. Harvey likewife remarks, that this ci- 

 catrice is found in all eggs, whether they be fe- 

 cundated or not; and that thoie are deceived who 

 imagine it to be produced by the feed of the 

 male. It is of the fame fize and form in frelh 

 eggs as in thofe which have been long kept. 

 But, as foon as the procefs of hatching is begun, 

 whether by means of artificial heat, or by the 

 heat of the hen, this fmall mark or cicatrice gra- 

 dually augments and dilates like the pupil of the 

 eye. This is the hrff change, and it is vifible 

 after a few hours incubation. 



When 



