External Factors and Size 



139 



110 



100 



90 



QO 



c 



cj 70 



PL 



C 60 



§50 

 to 



o 



pq 



30 



20 



10 







4 8 XL 16 20 24 28 



Age of culture in days 



32 



Figure 43. Effect of age of culture at 22° upon the mean dimensions of 

 the body of Stylonychia pustulata. Volumes are calculated at / X b*. (Data 

 of Enriques, '09). 



