30 Regulation of Size in Unicellular Organisms 



nearly the same time for all individuals. Hartman 

 drew samples of blood every hour and measured the 



900 



800 



od 700 

 o 



600 



ZJ 



o 



c 500 



CD 



^4C 



o 



> 



r2 



300 



200 



100 











8 12 16 20 



Time in hours 



24 



28 



Figure 14. Progression of total body volume in the rhizopod Hartmanella 

 hyalina, and the effect of starvation and refeeding. Each of the two curves 

 represents the body volumes of one individual and all its progeny, kept at 

 21°C. (Data of Cutler and Crump, '27). 



sizes of twenty parasites in each of them. The loga- 

 rithms of the mean shadow areas were approximately 

 proportional to the time. It must be noted, however, 



