37. 



The results obtained by measuring the climatic 

 conditions at each altitude on both trees may shed 

 some light on the cause of the restricted distribution 

 of P.polypodioides at the different heights of the tree 

 and on the different exposures of the same height. 

 The total average evaporation per day at 12«2 meters 

 above ground on the juniper was 37,06 'cubic centimeters^ 

 on the south side, 46,79 cubic centimeters on the 

 northeast exposure, and 37,06 cubic centimeters on the 

 northv»'est side of the tree, At 7,5 meters the evaporation 

 per day was much lower being only 14,47 cubic centimeters 

 on the south side, 15, 46 on the northeast side, and 

 14,83 cubic centimeters on the northwest side. At 

 1#2 meters from the ground, however, the average daily 

 evaporation was a trifle lower, being only 12.64 cubic 

 centimeters on the south side, 13, IV on the northeast 

 side, and 14,13 cubic centimeters on the northwest side. 

 The light intensity at each of the selected elevations 

 on the juniper was practically the same and there was 

 hardly any indication of its possible influence on the 

 distribution of the epiphyte, Unquestionably, the intensity 

 of the light exerts an influence on the evaporating power 

 of the air and in that way only does it affect the 

 distribution of the epiphyte. 



On ftuercus stellata. where over eleven hundred 

 readings were recorded, the evidence supports the 



