38 



E. J. LUND 



cially in higher concentration, are very injurious, the organisms, 

 nevertheless, eat the grains of yolk. After one or more hours 

 the grains become stained deeply. This was the case in table 

 22 (b). The increase in the length of time of feeding (i.e., the 

 time the animals were left in the solution) is the cause of the 

 high mortality in table 22 (b). 



