40) 
THE DEVELOPMENT OF THE CHICK 
Kia. 16. — Five stages of the cleavage of the hen’s egg. (After 
Kolliker.) 
A. First cleavage furrow (x 14). The egg came from the 
lower end of the oviduct. 
B. Four-celled stage (x 17); from the uterus. 
C. Ten central and eleven marginal cells (x about 16). 
D. Nine central and sixteen marginal cells (x about 16). 
IX. Late cleavage stage (x about 22). 
