1842.] A Seventh Memoir on the Law of Storms in India. 1077 



Summary and Results. 



I shall now endeavour to deduce from the evidence afforded by the 

 foregoing documents and tables : — 



1. The origin and track of the Storm. 



2. Its circular (or other) motion. 



3. Its rate of travelling. 



4. Other phenomena. 



I. II.-— The Origin and Track of the Storm, with its circular motion, 

 will be best considered together. 



If we look in our table of the 20th instant, at the logs of the Algerine 

 and Ariel, p. 977 and 978, we shall find that in the S. E. part of the 

 Bay, or between latitude 10° and 14° N. and longitude 90° and 92£ 

 E* over a space of 290 miles, the distance of the two vessels apart, 

 some atmospheric disturbance was apparently taking place, and 

 over a considerable extent. This was continued on the following days, 

 but seems to have been nothing more, at least with them, than the 

 setting in of the monsoon ; for on the 31st May, the Ariel, Algerine, 

 and Norfolk were all, as will be seen, about in the middle of the 

 Bay, and within a circle of 100 miles in diameter, with variable 

 winds and squally weather from North to N. W., West, and S. W. 

 The Arethusa four degrees further to the Westward had a strong 

 monsoon. Up to the 1st June, indeed, these ships had nothing but a 

 strong monsoon. It was not then with them that the storm began, 

 and the only trace we find of it in the Bay, beyond the Sand Heads, is 

 with the John William Dare, which vessel being bound to Penang, 

 got as far as about latitude 17° N., and about on the line from the 

 Light Vessel to Cape Negrais, on her route from the Sand Heads, but 

 was obliged to put back on the 1st June. She had a smart N. 

 Easterly breeze in latitude 17° 5& and longitude about 93° 30', or 

 about 250 miles S. E. by S. from the Light Vessel at the Sand 

 Heads, on the 30th May ; and running to the Southward and Eastward 

 with this breeze it became a S. Easterly, S. S. Easterly, and eventu- 



* I use round numbers here ; the tracks of the two vessels are given upon the 

 Chart. 



