Continued. 



Key: 



1* - ovum from the ovary of bitch with embryonic disc 



(enlarged in 30 times) : 



6- 12th-day ovum of bitch with embryo (natural size) (from 

 Prevo and Dum) : 



VI - enlarged embryo of the same ovum; 



7- nearly three weeks ovum of bitch (natural size) ; 



VII a- embryo of the bitch; located on left side, after 

 removal of right half of cephalic vagina and right half of 

 intestinal sac (zaccus intestinalis) : ab- passage of mucous 

 plate of the intestinal sac in the cephalic vagina; acde- cut 

 cephalic vagina; ef- right descending vein, recurved backwards; 

 f"- its original position; e g- auricle of the heart; 



h- ventricle; ii- pericardium; k- bulb of the aorta; 1- aorta; 

 mno- brain; m- ear and medulla oblongata; ep- commissure or 

 groove of middle intestine; arep- left side of the intestine; 

 step- its right side; gr- angle, in which the left wall of 

 the intestine passes to the intestinal sac; uvw- vascular 

 area; grw- transparent area; us- ascending vein; xy**- amnion; 

 2- urinary sac or allantois: 



VII b- transverse section of the same embryo in the middle 

 of the back: -a- upper part of the back; ab- spinal (dorsal) 

 plate; be- ventral plate; d- intestinal sac; e- passage of 

 the wall of intestine in the wall of intestinal sac; 

 de- limb, according to Wolff; f- intestinal commissure, by 

 Wolff; g- laying of spinal column; h- notochord; i- amnion; 

 k- spinal chord; 



IX- middle sizes of swine Graafian follicles (enlarged 

 10 times) : 1- peritoneal epithelium; 2- formative cover of 

 the theca; 3- external layer of the theca; 4- internal layer 

 of the theca; x- stigma; 5- granular membrane of the nucleus; 

 6- fluid of the nucleus; 7- embryonic disc; 8- ovary: 



*In lettering on table of Baer, there is an explanation of 

 some parts of his illustrations only. 



295 



