X- Embryonic disc of the swine; 

 XII- ovary of cow with embryonic disc magnified by 10 times) ; 



XIII- ovary of woman with embryonic disc and granular 

 membrane (magnified by 10 times) ; 



XIV- corpus luteum of bitch (magnified by 10 times) : 

 1- peritoneal epithelium; 2- formative cover ; 3- external 

 layer of the theca; 4- corpus luteum; 5- its opening; 



6- albuminous mass; 7- scar of corpus luteum; 



XV- stigma of Graafian follicle (magnified by 10 times) ; 



XVI- embryonic layer from mature ovum of grass-snake 

 (magnified by 5 times) ; 



XXIV- nearly mature ovum of Eana tempovavia , sealed in 

 diluted nitric acid and cut by longitudinal axis (magnified 

 by 10 times) ; 



XXV- mature ovum of Rana temporaria with moved embryonic 

 vesicle (magnified by 10 times) ; 



XXVI- the same ovum with driven out embryonic vesicle 

 (magnified by 10 times) . 



296 



