1842.] A Sixth Memoir on the Law of Storms in India. 705 



The following is the Barometrical Table at Macao, which, by the 

 way, does not begin soon enough, for, if possible, the fall should always 

 be watched from the usual average till it again returns to the same 

 point. There are many very interesting questions connected with 

 the more or less gradual or sudden falls and rises of those instruments, 

 which observers can much contribute to solve by attending to this 

 remark : — 



Barometrical Register at Macao, Monday, the 26th July, 1841. 



" 7 30 a.m. 29.17 N. W. Rain. 



28.94 N. W. Heavy rain. 

 28.94 W. High wind. 

 29.00 S. W. Rain and high wind. 

 29.08 S. W. Ditto. 

 m. 29.25 S. W. Ditto. 



29.33 S. S. W. Moderating. 

 29.37 S. Gusts. 

 29.40 S. Less wind. 

 29.44 S. Heavy rain. 

 29.49 S. Ditto. 

 29.53 S. Ditto from wind. 

 29.58 S. High breeze. 

 29.58 S. Rain. 

 29.64 S. Ditto. 

 , 29.68 S. Ditto. 



29.70 S. Fresh breeze. 

 29.70 S. Ditto. 



The above Table shews, that the wind on the 2d day veered from N. 

 round to W. and S. W., but at Whampoa and Hong Kong, we have been 

 told it veered from N. round to E. S. E. and S. W., this would indicate, ac- 

 cording to the theory of Redfield, that the vortex passed between Macao 

 and Hong Kong. 



That the centre was at one time between Hong Kong and the 

 Lantao Passage, there can be no doubt ; as also, that this small tyfoon, 

 for it appears to have been of limited extent, was one coming up from 

 the S. E.bE., or about from the Grand Lema to the centre of Lantao 



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