84 



Mr. H. S. Eaton, 



in the lowest group at the average elevation of 124 feet by 100, 

 in the group at 234 feet it is 109-1 ; at 493 feet 129-4, and at 

 648 feet 136-1 ; from whence it diminishes at 841 feet to 134-7. 

 Hence it follows that between 124 feet and 234 feet the rate of 

 increase of depth of rain for 100 feet of elevation is 8-27 per 

 cent. ; between 234 feet and 493 feet this falls off to 7-84 per 



Fig. 2. 



I'ercentage of increase of rainfall with elevation, 1881 — 85. 



Fig. 3. 



Number of days annually on which not less than 0-005 inch of rain fell, 

 1881—85. 



cent. ; between 493 feet and 648 feet it further diminishes to 4-32 

 per cent. ; and in the highest group of all at 841 feet the 

 increase is altogether lost and is succeeded by a decline in the 

 amount of rain from the preceding group to the extent of 0-37 



