Internal Characteristics and Size 



119 



For, according to Jollos ('16), this is the period in 

 which the rate of reproduction is affected, and hence 

 the period in which irregularities of size are most prob- 

 able. So far modifications of size in the endomictic 

 cycle cannot be considered as demonstrated. 



rr 



u 

 t_ 



CD 



CD 



E 



.2 '0° 



o 



> 



O 



CQ 



50 



100 



75 S 

 o 



S- 



CD 

 O- 



50 ^ 



CO 



o 



CQ 



25 



840 



880 920 



Generations 



560 







Figure 35. Inheritance of body length, and of body volume (calculated as 

 / X b 2 ), in a clone of Paramecium aurelia. Between each of the four series 

 of measurements endomixis occurred once. (Data of Erdmann, '20, p. 133). 



Effect on inheritance. Has endomixis anything to 

 do with the subsequent inheritance of body size? It 

 seems certain that endomixis occurred many times 

 during the cultivation of Jennings's lines of Para- 



