300 



BOARD OF AGRICULTURE. 



prepared, and accept from them what they can give. I claim 

 that as due to science, and I think the sooner the community 

 understands it the sooner will all have the benefit of what 

 science can produce and cease to ask the impossible from 

 scientific men. 



In this first presentation of the subject of embiyology I shall 

 not be able to give the whole history of the formation of a 

 new being, but only so much of it as will satisfy you that our 

 higher animals produce eggs like birds and the lower classes ; 







;^2 



Fig.l. 

 Ovarian egg of dog. Copied from Bischoff 's 

 embryology of the dog. Magnified 100 diam- 

 eters. 



Fig. 2. 



Another ovarian egg of dog, from a female 

 in heat. Copied from Bischoff. Magni- 

 fied 100 times. 



Fig. 3. 



Ovarian egg of dog, freed of the cells 

 which surround the zona pellucida in 

 figs. 1 and 2. Copied from Bischoff. 

 Magnified 100 diameters. 



Fig. 4. 

 The same ovarian egg as that represented in fig. 

 3, cut open with a sharp needle. The mass 

 escaping is yolk, with the transparent germi- 

 native vesicle, in which the germinative dot ia 

 visible. Copied from Bischoff. Magnified 100 

 tunes. 



but with this essential diiference, that in mammalia the fecun- 

 dated Qgg is not cast or laid, but undergoes all its changes 

 within the maternal body until the living young is dropped. 

 Here are several figures of ovarian eggs of the dog, rabbit 



&&"- 



and human female, which may easily be compared with the 

 eggs seen in the ovary of a hen. Figures 1, 2, 3, 4, 5, 6, 

 7 and 8 are such ovarian eggs. 



