186 FOREST INFLUENCES. 



1 do not know that tlie formula for correction has as yet been used by them. Blau- 

 ford phiced his upper gauges at the height of 60 feet, i. e., above the tree tops, and the 

 lower ones at 1 foot. The result of his first year's observations showed tliat the high 

 gauges in the forests gave 4 per cent more rain than the high ones in the open fields, 

 a result entirely iu accordance with the facts and views we have already presented; 

 the gauges in the forests were at a height above the average toi)s of the foliage of the 

 trees, decidedly less than the 90 fectliy which the gauges in the open lands were ele- 

 vated above the ground, therefore the high forest gauges should experience less wind 

 and consequently catch more rain than the high open land gauges, while the average 

 rainfall for the whole country averages the same. Again Blauford's low gauge gave 



2 per cent greater catch in the forest than in the open land, a result also perfectly 

 accordant with our views (Met. Zeit., 1888, V, p. 23(3) and serving to di8sii>ate 

 the last argument in favor of the idea that forests appreciably increase the rainfall 

 as distinguished from the catch of the gauge. 



The preceding study assumes that of the local pairs of gauges one at least is high 

 enough to escape spattering from the ground, and this is easily attained in ordinary 

 rains, but iu the case of drifting snow this is difticult, and I williiresent my coiiclu- 

 eious as to the correction for drift and spatter at some future time. 



