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 [X.—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 







1895 | 1896 
| 
Date River | hemp: Dash. | Date River Temp. Dasph. 
gage | | anosoma | | Pe Eee y anosoma 
a | te ss te 40 
—— a | —— | “ 10] 4.00 79.5 800 
Aree || eon Meee 1250: || 79) eer 
July 23 | 5.20 so 424) “ 23 | 4.20 | 80 | 120 
e959) 5 se." 75 Sen 240 || « 28 | 6.40 | 82 7,440 
Aug. 1 | 4.20 78.5 |. 1,088 || Aug. 3 | 8.50 | 80.3 160 
Sul 2663 79 988 || “ 8 | 3.40 | 86 | 14,260 
| eo 84.8 9,800 Ilr © - 295) 1 720 | 82 2,240 
LD I P05 Sits 19,662 | « 21 | 7.10 79 880 
ON Dae 80 7,950 CS Vania 50 ToS 600 
—— —= | S|  29'| 6.00 74.3 440 
Sepia 5/256 70 74 189 || Sept. 16 | 4.10 73.5 663 
Coe LDA 73200 79 1,053, ||" 528) $3 0snn 430 58. i 80 
« 99 | 3.20 | 79 | 468 || 2 pes) ee 
Ce 0 (DESO AI evi 2 — 

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