86 



Mr. H. S. Eaton, 



atmosphere. When that is low, or, m other words, when the air is 

 dry, a relative excess of rain is experienced at the lower stations. 



Fig. 4. 



Eatio of the monthly to the annual rainfall, 1881 — 85. Continuous line, 



10 upper stations ; average elevation, 594 feet above sea-level. Dotted line, 



11 lower stations ; average elevation, 193 feet above sea-level. 



while a high degree of humidity is favourable to a more copious 

 precipitation at the upper stations. Numerically the proportion 

 of the rainfall of the upper to that of the lower group for the 

 five months, November to March, was as 106 to 100, the number 

 of rainy days being as 107-7 to 100 ; and for the seven months, 

 April to October, it was as 96 to 100, and the number of rainy 

 days as 105'3 to 100, the relative humidity of the air for the 

 corresponding periods being respectively 87 and 78. 



