94 



THEORY OF EVOLUTION 



state that we call an animal or plant come from 

 the fertilized egg. An hour or two after fer- 

 tilization the egg divides into two cells (fig. 

 47). Then eacli half divides again. Each 



Fig. U. An egjr, and the division of tlii; egg — tlie so-called 

 process of cleavage. (y\fter SelcnUa.) 



