RESULTS OK COMPARATIVE OBSERVATIONS : PRUSSIA. 253 



It aiipears from the foregoinp: tables that but very slight difference 

 appears between the absolute moisture of the field and woods, the devia- 

 tion in no case amounting to a millimeter of pressure. 



But with the relative moisture, the case is different, the greater per- 

 centage being in favor of the woods, and the summer mouths. It will 

 bo further seen that there are two minima of relative moisture, one ia 

 April and the other in August, the intervening period being somewhat 

 higher, but not so high as in the winter months. 

 Evaporation. (Millimeters.) 



