288 



DAVID DAY WHITNEY 



TABLE 6 



Experiments with Brachionus -pala and a -pure diet of Oilmnydomonas showing 

 that when the Chlamydomonas were caused to he very abundant by the addition 

 of fresh culture media the percentage of the male-producing female rotifers was 

 very high and the percentage of the female-producing female rotifers was very 

 low but when no fresh culture media was added, and thereby causing the Chlamy- 

 domonas to occur in moderate numbers the percentage of male-producing females 

 was very loio and the percentage of the female-producing females was very high. 



