186 



the latter latitude across the equator, and from theuce to lat. 25 S. 

 Within the last- mentioned limits, the difference was very consider- 

 able, being generally from five to nine hundredths of an inch, both 

 in the day and the night. 



When the ship arrived in lat. 28 S., long. 27 W. (June 7th), the 

 mercury no longer performed the equatropical motions, but was irre- 

 gular and fluctuating until July llth, when the ship was in latitude 

 27 S., long. 51 E. The equatropical motions then took place again, 

 and continued with great regularity while the ship sailed up the 

 Madagascar Archipelago, and across the equator, until the arrival of 

 the ship at Bombay, on the 31st of July. 



On the 6th of August the barometers were placed on shore, and, 

 from that day to the 12th, the mercury appeared to have a small 

 tendency towards the equatropical motions ; from the latter day to 

 the 22nd of the same month, that tendency was so much diminished 

 as to be generally imperceptible. 



On the 23rd of August the barometers were again put on board 

 the ship, which left the harbour of Bombay on the 26th. The mer- 

 cury then immediately began again to perform the equatropical mo- 

 tions, and continued them, with great uniformity, down the Malabar 

 coast, across the bay of Bengal, in the strait of Malacca, and through 

 the China Sea, until the ship arrived in Canton river, on the 4th of 

 October. The mercury then became nearly stationary, or, if it 

 showed at times a small inclination towards the equatropical mo- 

 tions, such inclination was not by any means so perceptible as at 

 sea. 



The ship remained at Canton till the 2nd of December, and, al- 

 though there appeared at times a slight tendency in the mercury to 

 perform the equatropical motions, the rise and fall was in general so 

 small as to be frequently imperceptible ; but, on the departure of the 

 ship from Canton river, the motions instantly took place, and con- 

 tinued until the ship arrived in Bombay harbour, on the llth of Ja- 

 nuary 1803. 



From that day to the 23rd of May, the ship remained at Bombay ; 

 and during the whole of that time, no tendency towards the equa- 

 tropical motions worth noticing could be perceived. On the above- 

 mentioned day, the instant the ship left the harbour, the motions of 

 the mercury again took place, and continued, but not always with 

 equal regularity, until the 2nd of July, when the ship again entered 

 Canton river. 



During the time the ship continued at Canton, no appearance of 

 the motions here treated of, worth remarking, could be perceived ; 

 but as soon as the ship left the river, on the 13th of September, they 

 again took place, and continued until the 13th of October ; when, 

 upon entering the Strait of Sincapore, they appeared to be diminish- 

 ed, but re-assumed their usual appearance as soon as the ship had 

 passed the narrow part of the strait. On the 21st of October the 

 ship arrived in the harbour of Prince of Wales's Island, and a great 

 diminution again took place in the equatropical motions ; but upon 



