294 Variation of the Barometer between the Tropics. 



the river the mercury appeared to conform in a small de- 

 gree to the equatropical motions ; but when well up the 

 river, at Diamond harbour, the mercury inclined to be 

 nearly stationary during the twenty-four hours, as has for- 

 merly been observed to happen in Canton river, Bombay 

 harbour, &.c. 



On January 13th, 1804, after we had cleared the river 

 Hoogly, the mercurv in the barometers began to perform 

 its motions with uniformity, which continued during the 

 passage to Bombay until our arrival there on February 12th. 

 The barometers being then placed on shore, the mercury 

 inclined to a stationary position, without evincing any pro- 

 pensity towards the equatropical motions from the 12th to 

 the 18th of February 1804^ as has been noticed in the fore- 

 going description to happen frequently on entering a har- 

 bour from sea. 



On February 1 8th, 1 804, the meteorological journal ceases, 

 4t which time it comprises the observations of twenty-two 

 months, having commenced April 6th, 1802, in Margate 

 Poad. 



I have taken the liberty of sending you this abstract from 

 the journal, to exhibit the apparent difference of the mer- 

 cury in the barometer at sea, from what has been observed 

 on shore, at those places mentioned in the preceding de- 

 scription. As I have not seen any account indicating the 

 phaenomenon, I thought it might be interesting to you, or 

 other gentlemen of the Royal Society, to forward this im- 

 perfect abstract, the journal itself being too cumbersome to 

 send home at present. But as I am in expectation of return- 

 ing to England bv the ships from China next season, I hope 

 J shall be enabled to present you with the meteorological 

 sheets alluded to above. 



I am, &c, 



J. HORSEUBGH. 



P. S. Since I wrote the foregoing abstract I have re- 

 ceived a letter from my friend Mr. Dalrymple, intimating 

 that a copy of the meteorological journal itself would be 

 accept,ible ; which has induced me to transmit to him the 

 original sheets, with a request to deliver them to you. I 

 regret tiiat I could not find leisure time to make out a fair 

 copy to have sent to you, in place of the original sheets in 

 their rough state, 



Bombay, 

 ifune 1, 1804. 



JUVI. An 



