118 



DAVID DAY WHITNEY 



TABLE 6 

 Experiments unth mass cultures of the salt water rotifer, Brachionus mulleri, show- 

 ing (1) that when oxygen was allowed to pass through the nine day old unbalanced 

 culture water the food supply was increased as was indicated by the greater num- 

 ber of eggs found attached to each female, (2) that when oxygen was allowed to 

 pass through the seventy-nine days old balanced culture water containing many 

 green organisms upon which the rotifers fed there was no increase in the food 

 supply as was indicated by the number of eggs found attached to each female, 

 (3) that a great increase in the food supply caused by adding bouillon produced 

 a larger number of male-producing females than was produced by allowing oxygen 

 to pass through the culture water for twenty-four hours 



