CONTROL OF SEX BY FOOD IN ROTIFERS 



275 



in a towing from a small pond in Middletown. These rotifers are 

 also very small and only mass culture experiments were made. 



TABLE 2 



Experiments with Diaschiza sterea and two diets of pure cultures of Polytoma and 

 Chlorogonium shoxoing that only females were produced in the colorless diet of 

 Polytoma hut when the female rotifers were transferred to a diet of Chloro- 

 gonium males appeared soon in the cultures. 



