248 



data of the appended table, which gives the statistics of temperature, 

 river level, and Diaphanosoma population during the periods of 

 maximum development in 1895-1898. All these data except those 

 of Diaphanosoma are shown graphically in Part I., Plates IX.-XII. 

 The data for Diaphanosoma are less complete than the others, since 

 all of the collections were not counted. 



In 1895 the Diaphanosoma pulse culminates at 19,602 on August 

 21, following immediately upon a heat pulse which culminates 

 August 15 at 85.3. The decline of the pulse occurs with a decline 

 of temperature to 72 on September 7. The declines, both of 

 Diaphanosoma and temperature, are hastened after September 3 by 



