128 Irregularities of Atmospheric pressure in Bengal, Sfc. [No. 2, 



Howrah, and was nearly of that amount at Midnapore in one 

 direction and at Berhampore in the other. 



In both months there was within these areas a focus of greatest 

 rainfall, around which, the quantity diminished with the distance. 

 This focus was about Oontai and Balasore in June, where the quan- 

 tity registered was between 30 and 40 inches, and in August was 

 situated about Hooghly, where the register exceeds 40 inches for 

 this month. 



The resultant directions of the winds at Calcutta, Saugor Island, 

 False Point, Cuttack and Jessore, as calculated from all the obser- 

 vations in each month are given in the following table ; comparative 

 prevalence being expressed by a number proportional to the whole 

 number of observations taken as 100. 



May. June. July. August. Sept. 



Jessore, .. 58 S.19E. 56 8. 6W. 74S.22E. 27S.16E. 55 S. 12E. 

 Calcutta,.. 80S. 5E. 75S.14W. 88 S .2E. 61 S.24W. 68 S. 18E. 

 Saugor Id., 85 S. 5W. 77 S.29W. 72 S.12W. 45 S.37W. 37 S. 12W. 

 False Pt., 81 S.24W. 60 S.47W. 68 S.55W. 58 S.87W. 40 N.83W. 

 Cuttack,.. 70S.11E. 48S.35W. 47S.47W. 42S.79W. 18S.39W. 



Now on comparing in this table the mean directions for June 

 and August with those of the other months, it will be observed that 

 the former are characterized by a comparative excess of westerly 

 elements. Thus at Calcutta, for example, the wind is East of South 

 in May, July and September, but West of South in June and 

 August. This general characteristic becomes very distinct when the 

 anemometric resultants are laid down on a chart, [see Plate Till,] 

 as wind arrows, the lengths of which vary as the figures expressing 

 prevalence. At Jessore the August mean is an apparent exception, 

 but the figure expressing prevalence, is so much reduced as to 

 indicate a considerable deficit of Southerly and increase of Nor- 

 therly elements.* A similar difference is shewn by the mean of 

 Berhampore. 



A comparison of the June and August wind resultants with those 

 of the same stations for any of the monsoon months of 1869 entirely 

 bears out the above inference as to the unusual prevalence of a 



* The detailed table from which the mean resultant is computed shews 

 this to be the case. 



