The Life-History of Hypotrichous Infusoria. 



623 



Tabulated Results of Salt Experiments. 



Record of the variation in the number of divisions of each initial stimulus experiment from 

 the control, during each five-day period; and also the net effect for the whole twenty days of the 

 experiment. For example: the KH2PO4 ^^^ culture, during the first five-day period, divided 

 exactly the same number of times as the control; during the second period, two times less; during the 

 third, nine times more; and during the fourth, three times less than the control. For the four per- 

 iods of the experiment, then, there was a total variation of fourteen divisions, or a "net effect" of 

 four more divisions than the control 



