36 Regulation of Size in Unicellular Organisms 



showed that increase of volume was most rapid just 

 after fission. But Estabrook ('10) found that noth- 

 ing was ingested by Paramecium for the first thirty 

 minutes of its individual life. Estabrook went on to 



1 5 



Time after fission in hours 



24 



Figure 17. The influence of starvation upon growth in length and in volume 



(calculated at / X b 2 ) in individuals of a clone of Paramecium caudatum. 



Time plotted on a logarithmic scale. Each point represents the average of 



measurements made upon 10 to 35 fixed individuals. (Data of Estabrook, '10). 



compare individuals which were denied food through 

 being placed either in sterile tap-water or in Chamber- 

 land-filtered hay-infusion, with controls which were 

 fed. He found (figure 17) that during at least the 



