Diagram /. 



Pangenesis. 



B XC ) @^c) 

 Stage 2. 



Stage if 



Stage i. 

 Diagram ///. 



Development of 

 Identical Twins. 



Stage 5. 



Stage 3. 



B YC 

 - ' v_^ 



Stage 2. 



Stage i. 

 Diagram //. 



Continuity of 

 Germ- Plasm. 



7ojace p. 120 



