1870.] Proceedings of the Asiatic Society. 93 



become S. E. During the greater part of it they were westerly, and 

 in September they veered to north east. Hence apparently the 

 dryness of the N. W. P. throughout the season. 



In 1869, shortly after the redistribution of pressure in March, a 

 slight depression appeared over a region including Berhampore, 

 Monghyr, Patna and Hazareebagh. In May it was intensified, 

 especially over the first named station, and reached its lowest point in 

 June. There was then a mean difference of 0.14 of an inch between 

 Calcutta and Berhampore. The effect of this depression on the winds 

 and rainfall was similar to that of the Saugor Island depression of 

 the previous year. At Patna, the wind was north, and at Hazareebagh 

 and Cuttack south and somewhat westerly. The rainfall in this 

 month, as in the previous year, was heaviest, not over the place of 

 depression, but at some distance (150 miles) to north of it; especially 

 over Buxa (Bhotan Doars), Dinajpore and Eungpore. Generally it 

 exceeded 20 inches over the country north of the Pudda river. In 

 the Delta it was below 20 inches. 



In July, August and September, the depression did not disappear* 

 but appears to have moved westward. So that, at the end of the 

 rains, Monghyr, Patna and Hazareebagh were all lower than 

 Berhampore. 



In conclusion, Mr. Blanford commented on the peculiar re- 

 lation that appeared to exist between the place of greatest barometric 

 depression, and that of greatest rainfall, the latter appearing al- 

 ways to be to north of the former in the instances cited ; and he 

 suggested as a possible explanation, the existence of two barometric 

 depressions, so related that one would act by retarding, without 

 arresting, the wind currents in their progress towards the other. In 

 such a case, it appeared possible that an accumulation of air would 

 be produced not over but somewhat beyond the site of the first 

 depression, and that the heaping up of a nearly saturated atmos- 

 phere, aided by diffusion of the vapour, would determine an 

 excessive rainfall in that place. 



He also pointed out the apparent influence of the Berhampore 

 and Monghyr depression, on the course of the Cyclones which passed 

 over Bengal in 1869. The first, in May, passed over Jessore ; the 

 second, in June, when the Berhampore depression was most intense, 



