114 



FOREST INFLUENCES. 



There are, however, considerable variations in the elevations of the 

 stations employed to get the average values given. 



following table; the values having in both cases been equalized to eliminate irregu- 

 larities by calculating the means of each three to four years by the formula 



2a+J), a+2b-{-c, b-\-2c+d , etc. 

 3~" 4 4 



Table 1. — Equalized values of precipitation, in millimeters. 



From this table the percentage of rainfall in Lintzel, as related to the rainfall of 

 each of the other stations, is calculated as follows: 



Table 2. — Bainfall at Lintzel calculated as percentage of rainfall at certain places. 



The author concludes that if the increasing reforestation at Lintzel had no influ- 

 ence on the amount of rainfall, the figures for Lintzel should have been nearly in 

 constant proi^ortion to those for the other stations, while from the percentage table 

 it appears that with reference to neighboring stations the precipitation at Lintzel has 

 increased with the increasing forest growth. The diiierences in the last years are 

 not so apparent, because the values could not be properly equalized. It is, however, 

 undoubtedly proved that at the beginning of observations the rainfall at Lintzel was 

 less than at any of the neighboring stations and that subsequently it increased from 

 year to year, until it was in excess of the other stations, except at Hamburg. 



Comparing the rainfall at Lintzel witli that of the other stations, and calculating 

 it as percentage of the mean rainfall of the latter, the following series is obtained: 



Per cent. 



1882 81.8 



1883 ? 86.3 



1884 95. 2 



1885 99. 8 



1886 100. 6 



. 1887 103.7 



1888 - 103.9 



This constant increase, going hand in hand witl^ the increase of forest cover in exr 

 tent and height, leaves Ijardlj^ any 4o«ht ag tq t"^^ close relation of the t^vo condjr 

 tious.-}}. e', F, 



