EESULTS OF COMPARATIVE OBSERVATIONS: SWITZERLAND. 257 



III. 



-Mean temj^erature of the trees, above or ieloro the mean temperature of the air in the 

 ivoods, at the place of observation.''- (Centigrade). 



'In preparing this table we have taken the difference of the temperature within the trees at breast 

 high and that of the open air at the same height. The temperatures in the tree tops, within and with- 

 out the tree, are a' 



17 F 



