Rates of Growth of Individuals 



21 



ingly slow at first and only towards maturity does it 

 become rapid. It is difficult to find any innate inferi- 

 ority of these data as compared with those of Jen- 

 nings; but the result is far different with respect to 

 breadth and to volume. 







8 12 16 20 



Time after fission in hours 



24 



Figure 7 . Growth in length and in volume (calculated as / X b 2 ) in a clone 

 of Paramecium caudatum. Each point represents the average of measure- 

 ments made upon at least 90 fixed individuals. (Data of Estabrook, '10). 



Other observations. A few individuals of Para- 

 mecium caudatum were measured by Popoff ('09). At 

 all ages the number measured was only fifteen, and it 

 is surprising that the results are at all regular, as figure 

 8 shows them to be. But each of the fifteen was com- 

 pared in dimensions with its own sister which was 



