1 8s Mr. Horsburgh’s Observations on a 
the mercury seemed to incline towards the equatropical mo- 
lions in a very small degree ; and, during the month of April, 
and to the 20th of May, this small tendency of the mercury to 
perform the motions appeared at times, but was hardly dis- 
cernible, the rise and fall being of so small a quantity. From 
the 18th of January to the 20th of May, the mercury in the 
barometers was in general stationary, except a very small ten- 
dency towards the equatropical motions at times. At other 
times some change in the atmosphere disturbed the mercury 
from its stationary position ; but this was seldom the case, as 
it was then the fair weather season, or north-east monsoon. 
We sailed from Bombay on the 23d of May, 1803. The 
instant we got out of the harbour, the mercury in the baro- 
meters conformed to the equatropical motions with great 
regularity, and the difference between the high and low stations 
was very considerable during the whole of the passage to 
China, excepting a few days in the eastern parts of Malacca 
Strait, where the land lay contiguous on each side of us ; the 
difference between the high and low stations of the mercury 
was then not so great as in the open sea. On clearing the 
Strait, and entering the China Sea, the equatropical motions 
were performed in greater quantity, and continued regular 
during our passage up the China Sea, until July 2d, 1803. We 
then entered Canton river, and the equatropical motions of 
the mercury in barometers entirely ceased. 
From July 8th to September 7th, the barometers were placed 
on shore in Canton, during which time the mercury appeared 
to have no tendency towards performing the equatropical 
motions ; but it inclined to a stationary position, except when 
influenced by changes of weather. After the barometers were 
