46 



C. Little — On two remarkable rain-bursts in Bengal, [No. 2 3 



because of the change from intense hot weather in Bihar, the United 

 Provinces and the Punjaub, to the cooler weather of the monsoon season. 

 Though the intermediate changes of temperature are less marked in 

 August, there is abundant evidence of the line of advance of the wave 

 of change ; and the low temperature in Assam on the 11th and 12th, 

 followed after au interval of two days by what may be called wintry 

 weather in Kashmir, affords a succession of events which it would be 

 difficult to account for, except on the supposition of a westward-moving 

 atmospheric disturbance. But in my opinion the most striking simila- 

 rity in connection with these two disturbances is afforded by the heavy 

 general rainfall in Bengal Proper on the 30th Jane and the 11th August. 

 In the latter case particularly, it is obvious that no disturbance entered 

 Bengal from the Bay, which had been singularly calm throughout the 

 week from the 8th to the 14th August. The wind direction at Dia- 

 mond Island was westerly throughout the period, and velocity day by 

 day was below the average for the season. In both cases, as shown by 

 the following Table, there was considerable increase of wind force at 

 Saugor Island; but the direction continued south-westerly, showing that 

 the change was due to some influence to the north, and the record of the 

 Pilot Brig shows that the strong winds extended to no great distance 

 southward from the Bengal coast. 



Table giving the luind force and direction at Saugor Island during 

 the two periods of disturbed lueather. 



June. 



Daily velocity 

 in miles. 



Wind direction 

 at 8 a.m. 



August. 



Daily veloeity 

 in miles. 



Wind direction 

 at 8 a.m. 



27 



312 



S.S.W. 



8 



360 



S.W. 



28 



408 



S.S.W. I 



9 



504 



S.S.W. 



29 



576 



S.S.W. 



10 



768 



S. 



30 



840 



S.S.W. 



1 



394 



W.S.W. 



July. 



J 



360 



w.s.w. 



1 12 



288 



s.w. 



2 



456 



s.w. 



13 



384 



w.s.w. 



3 



384 



s.w. 



1 



14 



120 



W.N.W. 



One difference which may be noted, as shown by the above Table, is 

 that the highest velocity in the earlier disturbance occurred at Saugor 



