154 THE EVOLUTION OF MAN. 



ance with the facts which Ontogeny places before us ; 

 whether in the evolution of the individual organism 

 from the egg-cell, the same phenomena appear, which we 

 have presupposed as necessary in this comparison. The 

 ontogenetic structural process proves to be in very close 

 harmony with our conclusions, and we find that the facts of 

 the evolution of the individual which can be seen under the 

 microscope, do in fact correspond perfectly with the picture 

 of the process of phylogenetic evolution which we have 

 sketched d priori. The first processes which occur in the 

 evolution of the individual from the egg-cell, and also the 

 succeeding simple processes which first come under observa- 

 tion, really correspond to the events which we have just 

 traced in the development of a colony of savages, and have 

 assumed as the first phylogenetic processes in the origin of 

 a many-celled organism. 



In the first stage of the evolution of the individual, 

 many homogeneous cells first arise, from the simple egg-cell, 

 by continuous division. These are exactly comparable to 

 a community of human beings as yet uncivilized. These 

 homogeneous cells increase still more, so that the accu- 

 mulation of cells ever increases. As in making our 

 comparison we found that an entire colony of savages pro- 

 ceeded from the descendants of a single isolated human 

 pair, so likewise all the homogeneous cells of this multitude 

 (which we shall hereafter learn to know better under the 

 name of cleavage-globules), are inter-related as the de- 

 scendants of a single pair of cells. Their common father 

 is the male sperm-cell, and their common mother the female 

 egg-celL 



At first, all these numerous cells which arise bv the con 



