184 Regulation of Size in Unicellular Organisms 



dividuals had nuclei of 14 micra diameter, these indi- 

 viduals had nuclei of 70 to 196 micra, which repre- 

 sented an increase of about 1,000 times in volume. 



175 



CD 



150 



CD 



125 



100 



en 75 



£ 



50 



25 





 12 3 4 5 6 



Days of starvation 



Figure 62. Effect of starvation upon the volumes of the body and of the 

 macronucleus in Paramecium caudatum. Volumes were calculated as 

 / X b 2 . This experiment is one of three ; on each day ten individuals were 

 killed and measured. (Data of Kazanzeff, '01). 



Such nuclei were stated not to be forming cysts; they 

 did not recover their former size, nor did the indi- 

 viduals survive. It is possible to regard the change as 

 irreversible and of no physiological significance in the 



