6 



HEREDITY AND SEX 



Fig. 2. — Conjugation in Parama?cium. The micronucleus in one indi- 

 vidual is represented in black, in the other by cross-lines. The macro- 

 nucleus in both is stippled. A-C, division of micronucleus into 2 and 

 4 nuclei; C^-D, elongation of conjugation nuclei, which interchange and 

 recombine in E; F-J, consecutive stage in one ex-conjugant to show three 

 divisions of new micronucleus to produce eight micronuclei (J). In lower 

 part of diagram the first two divisions of the ex-conjugant {J) with eight 

 micronuclei are shown, by means of which a redistribution of the eight 

 micronuclei takes place. See also Fig. 100. 



