RESULTS OF COMPARATIVE OBSERVATIONS : SWITZERLAND. 261 

 VI. — Mean depth of rain and melted snow. (Millimeters). 



Mean depth of rain and melted snow 



n open fields and in ■woods, in different months of 

 the year. 



The effect of foliage in intercepting a part of the rains, more espe- 

 cially in summer (in deciduous forests), becomes quite apparent, when 

 tlie numerical quantities are drawn upon a diagram. Here again we 

 observe the perennial effect of evergreen foliage, in which the difference 

 hetween different seasons in a fir-forest is quite small as compared with 

 either of the deciduous kinds represented, and the total amount of this 

 difference is at all times greater. 



