552 



D. D. WHITNEY 



The temperature was uniform for all the individuals of each 

 experiment. When the individuals were put upon a Dunaliella 

 diet they were kept at 25 to 26°C. and the control individuals 

 were also kept at this same temperature. During the other 

 time both before and after the change in diet all individuals 

 were kept at room temperature of 18 to 20°C. 



The results of Maupas are very easily explained in the light 

 that is given by these experiments. Maupas probably used a 



TABLE 3 



Showing that young adult female-producing females reared on a Polytoma diet can 

 be forced to produce a high percentage of male-producing daughters among the 

 first children of each family by being put upon a Dunaliella diet and later these 

 same adult females can be forced to produce a high percentage of female-producing 

 daughters by being changed back to a Polytoma diet and still later they can be forced 

 to produce again male-producing daughters by being put back upon a DunaUella 

 diet 



