1084 A Seventh Memoir on the Law of Storms in India. [No. 131. 



We have thus shewn, that the Midnapore vortex was not the 

 Calcutta one, and that it was not the Cauvery's storm. We must 

 therefore consider it as a separate one, and generated in the neigh- 

 bourhood ; in other words, as an independent eddy from our greater 

 one, for though heavy, no great mischief was done. 



We must now, in endeavouring to ascertain the track of the storm 

 between the 3rd and 4th June, consider, that at noon on the 3d, (giv- 

 ing it, as I have done on the Chart, only a radius of 90 miles, or a 

 diameter of 180) its N. Western and Western quadrants, were then 

 impinging against the range of low hills which form the outliers and 

 parallel ranges of the Vindyha range* called to the North Eastward, 

 (or those to the South of Bhaugulpore on our Chart,) the Curruckpore, 

 further South the Pachete, and to the South of the Subunreeka river 

 the Balasore hills. We do not know the height of these, but some of 

 them may not be much short of 1500 or 1800 feet, the station of 

 Purulia being, by Barometrical admeasurement, 670 feet above Cal- 

 cutta: perhaps we may take 1000 feet as an average height, and W. 

 N. W. as the average direction of the longest vallies? These ranges 

 are separated, as will be seen, by the valleys through which the feeders 

 of the Soobunreeka, Roopnarain, and Dummooda rivers find their 

 way, and must, doubtless, with the transverse ridges and valleys, cause 

 much disturbance, and consequent irregularity, to a storm. It is cer- 

 tain, that buildings and groves of trees do so to the small whirlwinds, 

 and from strict analogy we may assume, that 500 or 1000 feet of hills 

 or ascents, with breaks and intervals amongst them, may do the same 

 with larger ones. 



If thus, as above said, we take a radius of 90 miles, and strike with it 



a circle of 180 miles in diameter on an accurate Chart,t we shall find 



as below : — 



By reports the wind was, 

 At The wind should be by estimate about 



Calcutta, N. N. E N. E. by N. 



Beacon Light Vessel, . . . . ' W. | N West. 



Kedgeree, N.W.^W due West. 





* This is the bending of the Vindyha chain to the South, to join the Coromandel 

 range, as sketched on my map in the First Memoir, Journal of the Asiatic Society, 

 vol. 8, p. 636, and also on the Chart to the present Memoir. 



t My Chart is not quite accurate. The tangents in the first column are laid down 

 from Commander Lloyd's Survey of 1840. 



