THE EGG OF THE DOMESTIC CAT 



155 



of sexually immature animals, or in those of mature animals, 

 at the beginning or a period of heat, or at any time during heat, 

 if pairing be not allowed, for these eggs never possess all and fre- 

 quently possess none of the characters enumerated in the last 



N. 



Co... 



Rb^ 



Zo. 



"T-- 



^ i. 





^.■./.-tfl-.^c-*!;^ .1 -is- .Jl • \ 



... Ov. 



if 6' 







S.S. 'yj >'r :-5^|^^^*--^^^*'^:€-^'C--...:X/:^^ 



\"t^' 





Fig. 3 Portion of a normal follicle just before rupture. B.v., blood vessels; 

 Co., corona; M.p., membrana propria; N., nuclei of granulosa cells; Oo., egg; P.b., 

 first polar body; Sp"., second polar spindle; S.S., shrinkage space; Zo., zona. 

 Note the round egg, perfect zona and corona, and great number of granulosa cells 

 between the egg and the inembrana propria. X 95. 



paragraph. That is to say, all normal eggs under such conditions 

 contain resting nuclei and the maturation of the cat's egg in so 

 far as it foreruns normal development, is dependent upon pairing. 



THE AMERICAN JOURNAL OF ANATOMY, VOL. 12, NO. 2 



