126 Irregularities of Atmospheric pressure in Bengal, fyc. [No. 2, 



May. June. July. Aug. Sept. 



Jessore, -761 -541* -584* ? -695* 



Berhampore, -777* -547* -590* -590* -715* 



Dacca, -831 -614 -636 *605 -739 



Monghyr, -701 -515* -542* '564* '679* 



Patna, -740* -549* -542* -574* *684* 



Benares, '747 -570 -573 -621 -710 



Eoorki, -694 *491 '517 '523 -658 



It will be observed that in June, (with the exception of the com- 

 paratively distant stations, Monghyr and Eoorki,) and in August 

 and September, (without exception as far as the table shews, 

 Hazaribaugh being, however, wanting in these months,) Saugor 

 Island shews the lowest mean barometric pressure. False Point 

 also shews a low mean pressure, which is however, 0*1 above that 

 of Saugor Island in August, and 0-03 to 0'04 in the other months 

 after May. The Calcutta mean readings are from 0*045 to 0*12 

 higher than those of Saugor Island throughout, and those of 

 Cuttack (except in August when this station shews the lower mean 

 pressure,) from 0-018 to 0*08 higher than those of False Point. 

 There was therefore, a persistent barometric relative depression 

 extending from Saugor Island to the SW. It was somewhat 

 changeable both in intensity and position, but the minimum always 

 lay nearer Saugor Island than any other station. The mean baro- 

 metric gradient between Calcutta and Saugor Island (70 miles) 

 was in 



May, one inch in 1555 miles. 

 June, ,, ,, 1458 „ 



July, „ „ 1029 „ 



Aug. „ „ 555 „ 



Sept., „ „ 843 „ 



and it did not finally disappear until December. 



There was another area of barometric depression to the NW. 

 and NNW. of the above, (as is shewn by Hazaribaugh and 

 Monghyr) which would seem to be more regularly recurrent than 

 that which lay about the Sand Heads, and is probably due to the 

 elevated and hilly character of the country. In Jury the mean 

 pressure at Hazaribaugh was lower than at Saugor Island. 



