6 Seventeenth Memoir on the Law of Stoi'ms. [Jan. 



REMARKS. 



Upon laying down the Hashmy" s track and taking the storm, if not 

 fairly begun, to be threatening at noon on the 25th, I find that produc- 

 ing backwards the track of the London Thetis* storm upon the chart 

 appended to the Fourth Memoir, a point on it would agree for this day 

 very well. The wind being at N. N. E. would place the centre of the 

 storm at E. S. E. from the ship, and taking backwards the distance 

 from noon to midnight on the 22nd, as there marked, it also agrees so 

 far as such acute angles and large distances can be expected to do, the 

 centre at noon on the 22nd would fall, however, about 70 miles further 

 to the eastward than where it is marked on our chart, when laid down 

 by the positions of the two ships, the Hashmy to the north-west, and 

 the London Thetis to the W. S. W. of it. 



For the 23rd, when both the ships lying too had fallen into the ad- 

 jacent quadrants, from the storms having rapidly passed on between them, 

 making the Hashmy to have now the centre bearing S. W. and the 

 London Thetis the centre N. W. from them respectively, our centre is 

 exactly correct, and the weather and Barometer exactly as they were 

 to be expected, i. e. the weather more severe, because the centre was 

 now nearer to the vessel, and the Barometer rising, because it had passed 

 and was leaving her. 



On the 24th, all the ships had fine weather. We have here an in- 

 stance, and it is principally on that account that I have placed these two 

 tracks again on our present Chart, of the complete reliance which, with 

 careful observations of the wind, weather and Barometer, may be placed 

 on our science ; for no careful commander can now in future doubt, I 

 should think of the awful risks which running on with a falling Barome- 

 ter may expose him to, and no sailor who understands common trigono- 

 metry can doubt, I should suppose, of the accuracy of our deductions, 

 and that they might, with the knowledge we now possess of the laws by 

 which the Cyclones of the China Seas are governed, have been perfectly 

 made on board the respective ships (including here the unfortunate 

 Golconda, with her 400 victims) at any time during the tempests, so 

 as to indicate to them all the best plans for escaping from, and even 

 for profiting by the Cyclones, by a little curving in their courses.* 



* Since this was written I have been favoured by my friend, Dr. Collins of the 

 ship Queen, with a copy of the log of the ship Sophia, which ship, with the Minerva 



