BAROMETRICAL VARIATION. l9 



ifie barometers being great to the day we entered the harbour Tropical varia- 

 of Bonibay. From the 12th of Aiiguft to the 22d the mercury Jj^^";^"^ '''^ ''*^*'' 

 could not in general be obferved to have any inclination to 

 perform the equatropical motions, although at times a very 

 fmal! tendency towards performing them might be per- 

 ceived. 



On the 23d of Auguft the barometers were taken from the 

 fliore to the {hip. Immediately on leaving Bombay harbour, 

 Auguft 26th, 1802, the mercury in the barometers performed 

 the equatropical motions, and continued them with great uni- 

 formity, during our paflage down the Malabar coaft, acrofs 

 the bay of Bengal, in the Strait of Malacca, and through the 

 China Sea, until our arrival in Canton river on the 4th of 

 October. When in the river, the mercury became nearly fta- 

 tionary during the 24 hours, except a fmall inclination at times 

 towards the equatropical motions, but they were not near fo 

 perceptible as at fea ; this change taking place the day we got 

 into the river. 



During our fiay in China, the barometer on fiiore, at Canton, 

 had very little tendency towards the equatropical motions, 

 throughout the months of 06lober and November that we 

 remained there. At times, while in China, a fraall inclination 

 towards performing the equatropical motions appeared : but, 

 as in Bombay, the difference of rife and fall was of fo fraall a 

 quantity, as to be frequently imperceptible. 



December 2d, 1802. On our departure from Canton river, 

 the equatropical motions were inftantly performed by the 

 mercury, and with great regularity continued during the whole 

 of the pafTage to Bombay, until our arrival in that harbour on 

 the nth of January, 1803. 



On January 18th, the barometers were placed on (liore, and 

 did not appear in the fmallell degree fubjed to the equatro- 

 pical motions ; although, with great regularity, they had been 

 performed while at fea, even to the day we entered the harbour. 

 One of the barometers was left on board for a few days, and, 

 like that on fhore, feemed to have no tendency towards the 

 equatropical motions. During the months of February and 

 March, in Bombay, the mercury was nearly ftationary 

 throughout the 24 hours. But about the latter part of March 

 the jnejTCury feemed to incline towards the equatropical mc 

 C 2 tions 



