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DAVID DAY WHITNEY 



Diagram 2 Brachionus pala. Experiment 1 of table 1. Showing the pro- 

 duction of a high percentage of male-producing females when the food conditions 

 were changed by the additions of bouillon. B indicates the addition of bouillon. 



Diagram 3 Brachionus pala. Experiment 3 of table 1. Showing the pro- 

 duction of a high percentage of male-producing females when the food condir 

 tions were changed by the additions of bouillon. B indicates the addition of 

 bouillon. 



