50 



FOREST INFLUENCES. 



rather than cooler temperatures. The curve is cotistructed ou the .same 

 scale as all the other figures of this chapter. The small May indenta- 

 tion is very curious and is unexplained. 



Depth of 0.8 inch. Depth of 4 .G inches. Depth of 9.3 inches. 



Fig. 8.— DiflVrence of soil temperature, under sod, and bare surfaee (sod — bare). Becquerel's observa- 



tion."?. 



From the report of Mr. Fernow for 1880, the following' tables are here 

 reproduced, combining results of various sets of stations in different 

 parts of Germany; the temperature is given in centigrade, the minus 

 sign denoting lower temperature iu the forest, the plus sign higher 

 temperatures. 



Differences of temperature of the soil inside and outside of a forest. 



The mitigating influence ou the soil temperature ajipears still more clearly when 

 the maximum and minimum temperatures for the year or the range of temperature 

 is compared. 



