HEREDITY AND SEX 



Conjugation in Paramcecium. The micronucleus in one indi- 

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

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

 1 nuclei; '" l>. elongation of conjugation nuclei, which interchange and 

 nbine in /•.': /•' ./, consecutive stage in one ex-conjugant to show three 

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

 port 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. 



