of the Barometet- letween the Tropits. 291 



When we reached the latitude of 28° south, longitude 

 ■27° west, June 7ih, the mercury in barometers no longer 

 adhered to the equatropical inotions ; but then, as in high 

 north latitudes, its rising and falling became irregular and 

 fluctuating during our run from latitude 28° south, longi- 

 tude 27° west (mostly between the parallels of 35° and 36° 

 south), until we were in latitude 27° south and longitude 

 51° east, on the 1 1th of July. The mercury then began to 

 perform the equatropical motions, and continued them uni- 

 formly during our run from the last-mentioned position, up 

 the Madagascar archipelago, across the equator, until our 

 arrival at Bombay July 31, 1602. 



August 6th, 1802. When the barometers were placed on 

 shore in Bombav, the mercury, for the first six days, ap- 

 peared to have a small tendency towards performing the 

 equatropical motions, but not equally perceptible as when 

 at sea, the difference between the high and low stations of 

 the mercury in the barometers being great to the day we 

 entered the harbour of Bombay. From the 12th of Au- 

 gust to the 22d, the mercury could not, in general, be ob- 

 served to have any inclination to perform the equatropical 

 :notions, although, at times, a very small tendency towards 

 performing them might be perceived. 



On the 23d of August the barometers were taken frorm 

 the shore to the ship. Immediately on leaving Bombay 

 harbour, August 26th, 1802, the mercury in the barometers 

 performed the equatropical motions, and continued them, 

 with great uniformity, during our passage down the Ma- 

 labar coast, across the bay of Bengal, in the strait of Ma- 

 lacca, and through the China sea, until our arrival iix 

 Canton river on the 4th of October. When in the river, 

 the mercury became nearly stationary during the twenty- 

 four hours, except a small inclination at times towards the 

 equatropical motions, but they were not near so perceptible 

 as at sea ; this change taking pjace the day we got into the 

 river. 



During our stay in China, the barometer on shore, at 

 Canton, had very little tendency towards the equatropical 

 motions throughout the months of October and November 

 that we remained there. At times, while in China, a small 

 inclination towards performing the equatropical motions 

 appeared ; but, as in Bombay, the ditference of rise and 

 fall was of so small a q<iantity ae to be frequently imper- 

 ceptible. 



December 2d, 1 802. On our departure from Canton river 



the equatropical motions were instantly performed by the 



T 2 mercury, 



