1888.] 



occurred at Dacca on April 7th, 1888. 



199 



more than equal rapidity, and in fact the southerly winds had been 

 pushed back much further than they had previously advanced, for on 

 this day their action was confined only to the area to the east of a 

 curved line represented by such stations as Saugor Island, Burrisaul, 

 Fureedpore, Serajgunge, and Dhubri. It is therefore clear that there 

 must have been a most unusual and rapid increase in the strength of 

 the dry westerly wind current on the 7th to have overcome the resistance 

 of the strong southerly current in such a complete manner, and the 

 actions of these opposing winds seem to be by far the most important 

 facts in the meteorology of the period, 6fch to 8th of April, during which 

 the tornado was formed. 



These changes in the areas affected by either the very dry westerly 

 or the very moist southerly current are best shewn by placing in a table 

 the humidities recorded at 10 a. m. at the various stations affected 

 on each day from April 6th to the 9fch inclusive. 



Table shelving the Saturation of air with moisture. 

 Complete saturation = 100. 







April 



April 



April, 



April 



District. 



Station. 



eth, 



7th, 



8th, 



9th, 







1888. 



1888. 



1881. 



1888. 



( 



Motihari 



14 



16 



6 



6 



Behar ... ... J 



Arrah ... 



13 



64 



10 



11 



( 



Bankipore 



9 



16 



8 



11 



Chutia Nagpnr 



Hazaribagh 







8 



4 



5 



/ 



Calcutta 



68 



70 



22 



13 



South-West Bengal ... j 



Burdwan 

 Berhampore 



45 

 18 



60 

 63 



14 

 17 



10 

 15 



' 



Jessore ... 



64 



68 



40 



50 



r 



Chittagong 



68 



65 



76 



79 





Burx'isaul 



72 



73 



73 



56 



East Bengal ...< 



Fureedpore 



65 



63 



61 



32 



1 



Dacca ... 



70 



72 



75 



50 



L 



Mymensmgh 



63 



68 



67 



18 





Bogra ... 



21 



58 



27 



14 



Rampore Beauleah... 



23 



64 



27 



18 



North Bengal 



Maldah... 



31 



49 



26 



27 





Dinagepore 



11 



13 



10 



7 



^ 



Rungpore 



16 



45 



45 



21 



The figures contained in this table may be more clearly grouped 

 into three districts : first, that to the west and north of the province, 

 second, that to the east and south, and, third, the district in the centre of 

 the province dividing the two. Arranged in this way the figures shewn 

 in the following table are obtained, and it will be seen that over the third 

 of these divisions, or over the area through which the barometric minimum 



