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GENERAL PRINCIPLES 



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Fig. i86. — Diagram of the process of conjugation in Paramoecium (on the 

 left), and of maturation and fertilization (on the right). In A and / the out- 

 lines of the cells are represented and the condition of the nuclei before and after 

 the changes they undergo. In each case white and black are used to distinguish 

 between the nuclear material of the two parent cells. In B-H the cell out- 

 lines are omitted. 



In Paramoeceum (on the left); A and B, temporary union of the two cells; C, 



