10 



Temp 



20 

 erature in°C. 



Figure 60. Effect of temperature upon the ratio of body volume to nuclear 

 volume, and upon the volume of the nucleus, in Paramecium caudatum. 

 Two clonal cultures {A and B) were used, each being kept successively 

 for at least 24 hours at each of the three or four temperatures. From 8 to 

 19 individuals were measured for each point, and in the graph the extremes 

 are all shown. Volumes were calculated as /X b 2 . (Data of Rautmann, 

 '09). 



