1080 A Seventh Memoir on the Law of Storms in India. [No. 131. 



p. 1,011,) they certainly include whirlwinds which are separate from, 

 although included in the main body of the storm, and our Calcutta 

 storm certainly separated into others on subsequent days. 



1st June — We have no data on this day from which we could with 

 any degree of probability assign any fixed centre for our Calcutta storm 

 of the 3rd, and indeed I am of opinion, that it was only now forming 

 itself,* in the Northern part of the Bay. 



For we find that at Chittagong and Noacolly, they had no signs of 

 a gale, Barometrical or of other kinds. At Burrisal, they had, it is 

 true, heavy rain and squalls from S. E. veering to E. in the evening 

 and blowing, hard all night ; but this may scarcely be considered, I 

 think, as more than an indication of the commencement of an atmos- 

 pheric disturbance at least till midnight ; and as I have before remark- 

 ed, we must allow of a commencement somewhere. A part of this 

 S. Easterly gale and rain may indeed have been owing to the Cau- 

 very's hurricane which was now, at midnight, as just described, at its 

 height ; but then we find that it certainly did not reach to the North- 

 ward and Eastward so far as the Floating Light, Saugor and Cdleroon, 

 all three of which had moderate weather (the Saugor even at day- 

 light " every appearance of fine weather ;") this must wholly preclude 

 our considering this Burrisal commencement as any part of the Qau- 

 very's hurricane. 



2d June. — We find, first as to the ships in the middle of the Bay, 

 from 15° to 17° 20' N. {Norfolk, Ariel, and Algerine,) they had, as has 

 occurred before, a heavy monsoon blowing across the Bay, the swell of 

 which seems also now just to have reached the Arracan Coast, produc- 



* I have before remarked, that these storms must begin somewhere. I may add 

 here, that they must also begin somehow and somewhen, i. e. we must find (or allow) 

 for their commencement, place, cause, and time,— if we can. We may suppose 

 that when a rotatory storm forms, it begins at the centre increasing outwardly— or at 

 the circumference— or in parts of either ? and these parts may be even at different 

 distances from the central space, and that, when the rota is formed by one set of 

 forces, another may begin to operate to move it onwards, and that its first progress 

 may be slow while the vortex is spreading ? We may also suppose, since, we know 

 nothing on the subject, that the same force which produces the rotation, produces also 

 the progression ? One of the first effects of the strong rotation and progression must be 

 to draw in other currents of air, or to throw them outwardly, and to influence those 

 already existing, that is to say, it may draw in by its progressive motion while it 

 throws others out by its rotatory (centrifugal) force ? 



