524 



GROWTH 



^^- 00000 OMITTED 



-50 



HOURS 

 1^ \ )L 



iZZl 



il2 |I8 |24 



Figure 132. A. Growth in volume of Paramecium caudal tim (P), Frontonia leucas 

 (F), from Popoff (1907, 1908), and of Harttnanella hyalina (H) from Cutler and 

 Crump (1927). B. Growth in length of P. aurelia. Data from Erdmann (1920). 



was reached. The rate of growth is influenced by the number of nuclei 

 present in the animal. 



Popoif (1908) measured the growth of Frontonia leucas in length, 

 breadth, and thickness, and estimated the volume as the product of 

 these three factors. The growth of the nucleus was measured similarly. 

 His data are given in arbitrary size units, which were converted into 

 micra. The growth of Frontonia was much more variable than Popoff's 

 growth data indicated to be the case for Paramecium, except for the 

 volume changes. The average volume of the cytoplasm and the nucleus 

 of the control animals killed at fission, was used as the value for zero 



