142 



Inthenext table I give theresults obtained from rain gauges 

 of two different kinds, placed in close proximity in the same 

 plane, and 3 feet from the ground. The one has a 10 inch 

 round receiver, and the other a 5 inch square receiver. 

 The large receiver had an excess over the small one in 

 every month excepting April, June, July, and December ; 

 but in June the rain-fall in both cases was the same. The 

 total difference of the fall in the two gauges was not great, 

 being less than half an inch on 48 J inches of rain-flill. In 

 comparing, however, the fall in the two gauges for an 

 average of five years, a larger difference arises, being more 

 than 6-lOths of an inch on an average fall of 36 inches, and 

 an excess of the large gauge occurred in every month ex- 

 cepting March. 



In the next table I give the results obtained from two 

 exactly similar gauges, placed at diff"erent heights from the 

 ground and free from every interference. Each gauge has a 

 6 inch square receiver, and the one is placed 3 feet, and 

 the other 34 feet above the ground. The total fall in the 

 one 3 feet from the ground was 47*943 inches, and in the 



