1870.] Irregularities of Atmospheric pressure in Bengal, 8fc. 129 



"Westerly element in the former, in other words of a deflection of 

 the monsoon from its normal course towards the East. The winds 

 do not indeed follow a spiral course around, and in to a place of 

 minimum depression as they would do in a cyclone, but they are 

 deflected from their normal direction to the Eastward, in all proba- 

 bility to feed an ascending current over Lower Bengal. Hence the 

 excessive rainfall already noticed at certain stations in Lower 

 Bengal, and as a consequence, the deficiency experienced by stations 

 to the NW. in the Ganges valley, with the predominance of 

 Westerly winds which characterized the greater part of the monsoon 

 of 1868 in the N. W. Provinces. Of these features the existence 

 of a persistent barometric depression in the head of the Bay seems 

 to offer a consistent explanation. 



I now pass to the monsoon of 1869, the barometric features of 

 which differed considerably from those of the previous year, and 

 which brought to the delta of Lower Bengal a rainfall somewhat 

 below the average, while in the NWP. the deficiency of rain up 

 to almost its close, was as marked as in 1868. 



May. June. July. Aug. Sept. 



Port Blair, 29-817* 29-770* 29-789* 29-810* 29-829* 



Madras, -733* -673* -717* '751* -777* 



Akyab, -782 -656 -701 -724 -804 



False Point, '763 -609 -626 -719 -748 



Cuttack, -710 -572 '626 -716 '733 



Ohittagong, '742 -600 -638 -731 -745 



Saugor Island, .. *705 -548 -566 -668 '704 



Calcutta, -680 '531 -566 -666 *708 



Hazaribaugh, .. -588 -481 '527 -624 '677 



Jessore, -669 -521 '554 '651 -701 



Berhampore, -665? '517? -562? -668 -709 



Dacca, '704 -566 -601 '684 '739 



Cachar, -752 -594 -630 -698 -761 



Monghyr, ? -482 -527 -596 -644 



Patna, -601 -494 '522 '619 -675 



Benares, -625 -505 -567 -641 -688 



Boorki, -560 '362 -510 -581 -663 



