Diagram 7. 



Pangenesis. 



f \ A ) 



Stage i? 



I A* 1 

 Stage i. 



Diagram ///. 



Devolopment of 

 Identical Twins. 



Stage s. 



Stage 4. 



Stage 3. 



Stage 1. 

 Diagram //. 



Continuity of 

 Germ-Plasm. 



'Jo face />. 120 



