NOTES. 



'433 



the stronger the wind the larger will be the proportion of small 

 drops that are carried past the gauge ; or again, the larger 

 the proportion of small drops and light flakes of snow that 

 constitute a given shower, the more a gauge will lose for a 

 given velocity of wind. In brief, the loss will depend both 

 upon the velocity of the wind and the velocity of the descent 

 of the precipitation ; therefore, a gauge will, in general, catch 

 less in winter than in summer ; less in a climate where light, 

 fine rains occur than where the rains are composed of larger, 

 heavier drops ; less in a country or in a season of strong 

 winds than of feeble winds ; less when exposed to the full 

 force of the wind by being elevated on a post, than when ex- 

 posed to the feebler winds near the ground. . . . 



" The distinction between the effect of the winds in heavy 

 rains and fine rains is very clearly brought out by Bb'rnstein's 

 classification of the catch on twenty-six days of fine rain and 

 forty-three days of heavier rains ; the percentages are shown 

 in the following table " : 



Rain gauges under trees do not record all the rain fallen. 

 The percentage of precipitation recorded under trees of 

 different kinds has been found as follows : 



