278 



DAVID DAY WHITNEY 



they lived and produced many daughters which produced in 

 their turn daughters. This was continued for several weeks 

 and many hundred females were produced but not a single male 



TABLE 4 



Experiments with Diglena catellina shmving that when the rotifers were fed the 

 colorless Polytoma diet no males were 'produced hut when the females ivere trans- 

 ferred to a diet of miscellaneous green flagellates males soon appeared. 



individual appeared during this time. However, when some 

 of these females were taken from the Polytoma culture and 

 placed in a weak culture water of bouillon and stable tea (10 



