2C0 RESULTS OF COMPARATIVE OBSERVATIONS : SWITZERLAND. 



V. — Jlean percentage of moisiure in the atmospliere. 

 (0 = absolute d-yness; 100 = saturation.) 



These quantities may be represented to the eye as follows : 



Mean percentage of moisture in the atmosphere of the open fields and of the woods, m the 

 difi'erent months of the year. 



The excess of moisture in the atmosphere of woodlands in summer, 

 and in evergreen forests at all seasons, is made quite apparent from this 

 table and the graphic illustration that accompanies it. The difference 

 observed in the fir-forest in winter would be more probably due to the 

 obstruction offered by the winds than to any effect due to organic life, 

 as might occur at a season of active growth when evaporation would 

 supply some_excess of moisture to the air. 



