FISHERIES, GAME AND FORESTS. 



505 



decreasing, with a consequent increase in the amount of rainfall appearing in the 

 run-ofT. For each year I have tabulated under the foregoing divisions the mean 

 temperature of each month, the total precipitation for each month, the total run- 

 ofl for each month, and the evaporation of each grand division — that is to say, the 

 total evaporation for the storage period, the growing period, and the replenishing 

 period, as well as the mean temperature for the whole year. Confining ourselves for 

 the present to the Sudbury, Cochituate, and Mystic drainage areas, we are struck first 

 of all with the fact of the exceeding persistency of the evaporation element. By way 

 of showing this saliently we may consider the following means for each of these three 

 streams, beginning with the Sudbury. For this stream we have: 



INCHES ON THE WATERSHED. 



Storage period, 

 Growing period, . 

 Replenishing period, 



Total. 



F"or the Cochituate area the figures are as follows 



Storage period, .... 

 Growing period, .... 

 Replenishing period. 



Total. 



For the Mystic area the figures are : 



Storage period, .... 

 Growing period, .... 

 Replenishing period, 



Total, 



From the foregoing tabulations we learn that the mean rainfall of the Sudbury 

 area for the period covered was 45.86, the mean run-off was 22.26 inches, and the 

 mean evaporation, 23,60 inches. For the Cochituate the mean rainfall was 46.83 

 inches, the run-off, 20.40, and the evaporation 26.43 inches. For the Mystic area, the 

 mean rainfall was 44 07 inches, the run-ofT 19.94 inches, and the evaporation 24.13 

 inches. From these figures we learn that the mean rainfall of the Cochituate area for 



