HEREDITY IN THE PROTOZOA 301 
four of the nuclei enlarge to form macronuclei, 
four others remain as new micronuclei. Then the 
individual divides twice (Fig. 70). The macro- 
A la 
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K x 
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Fig. 71.—Diagram illustrating the history of the micronuclei in.the 
conjugation and two subsequent divisions of Paramoecium. 
nuclei and micronuclei do not divide at this time, 
but are distributed equally to each of the first two 
individuals, and then at the second division two go 
