PLATE 4 



EXPLANATIOX OF FIGURES 



15 Culture Y, Line IV, 18th generation, February 26, 1914. Descending 

 phase. One micronucleus and some chromatin bodies visible. 



16 Culture Y, small tube culture, about 137th generation, April 22, 1914. 

 Descending phase. One chromatin body is in the macronucleus, others have 

 left it. 



9& 



