1842.] A Sixth Memoir on the Law of Storms in India. 685 



chorages near Macao ; and nearly on the line A. B. C. as marked on our 

 chart. 



5. That the rate of its progress was about seventeen nautical miles per hour. 



6. That the extent or diameter of the violent part of the gale, as deduced 

 from its duration and rate of progress, was about four hundred nautical 

 miles, or equal to six or seven degrees of latitude. 



7. That the latter induction agrees with the geographical evidence, 

 which has been obtained of the visitation of the storm. 



The progress of the tyfoon being taken at 17 miles per hour, it follows 

 that the excess of velocity of the wind at E. with the Raleigh, over that of 

 the wind at W. with the Lady Hayes, supposing the rotation to have been 

 in a circle, would be more than thirty miles an hour ; allowing nothing, 

 however, for difference of retardation of the surface wind, and not taking 

 into the account the additional retardation which the West wind of the 

 Lady Hayes must have been subject to, in its recurving course over the 

 land. If a circle be drawn on the chart around each of the points B. and 

 C, with a radius equal to 3 or 3| degrees of latitude, these circles will 

 comprise, somewhat nearly, the field of action of the storm at the two 

 periods of 9 a. m. of the 5th, and 2 a. m. on the 6th of August. 



The progressive velocity and course of this tyfoon is nearly the same as 

 that of the Trinidad hurricane of June, 1831 ; and the rate of progression 

 also corresponds nearly to that of the Antigua hurricane of August 12th, 

 1835. See Tracks Nos. I. and V. on my chart of the courses of hurricanes 

 in the April No. of the Nautical Magazine, 1836. 



This examination of the case before us, appears to shew, that the direc- 

 tion of rotation, and the course of progression of this tyfoon, which cross- 

 ing the China sea, agrees with those of the hurricanes of the West Indies ; 

 and that its course was not controlled, or materially influenced, by the ex- 

 isting South-west monsoon." 



1836. 



I have only the following notices of a storm in this year, from the 

 Chinese Repository : — 



About 29th July and 1st August, 1836, a severe gale was experi- 

 enced on the South Coast of China, which was very destructive to the 

 shipping in the China seas. The bark Susanna of Macao, and the 

 Admiral Buyskes, a Spanish ship, were lost with a part of their crews. 

 Apprehensions were felt for two or three other ships, the Hormasjee 

 Bomanjee, Hamoody, and Margaret Graham. 



The Repository of September says, in reference to this : The Hor- 

 masjee Bomanjee, Hamoody, and Margaret Graham, are given up 



4x 



