FOOD AND OXYGEN IN CONTROLLING SEX 



TABLE 4— Continued 



113 



paper some unaerated mothers in sunlight produced 87 per cent 

 of male-producing daughters. The mothers aerated in darkness 

 in the midst of Chlamydomonas produced only 35 per cent of 

 male-producing daughters. However, some of the unaerated 

 mothers in the midst of green food in the same dark incubator 

 produced as high as 76 per cent of male-producing daughters. 



In the sunlight experiments with Chlamydomonas shown in 

 the plotted curves of diagrams 1 and 3 and also in many experi- 



