18 RESULTS OF COMPARATIVE OBSERVATIONS: BAVARIA. 



Mean temperature of u'oodcd and unicooded soil, from the surface of the 

 earth to the depth of four feet, or infuence of the forests upon the mean 

 annual temperature of the soil. 



The tables resulting from this series of observations sliow that the 

 yearly means of a given location, at the several depths observed, are 

 nearly constant. The difference is less in the forests than in the fields, 

 and less at greater depths than near the surface. The mean temperature 

 diminishes with the depth, and is least at 4 feet. The general results 

 are given the following table : 



Mean temperature of the carih hy seasons (Eeaumur'€ scale). 



Therelation between these numbers may be readily shown by a diagram : 



f: — Tfl 



Sprinji^ 



-f^l^^Ji^ 



l7W^2ScZB7?> 



Jfzitt^ 



Mean temperature of the earth by seasons at different depths below the surfaca. 



t^ f^ f^ 



