180 Mr. Horsburgf/s Observations on a 
barometers was not so great, as it was from latitude io° N 
across the equator, and from thence to latitude 25 0 S. Within 
these last-mentioned limits, the difference of high and low 
stations of the mercury in the barometers was very consi- 
derable, generally from five to nine hundered parts of an 
inch, both in the daily and nightly motions. 
When we reached the latitude of 28° S, longitude 27° W, 
June 7th, the mercury in barometers no longer adhered to 
the equatropical motions ; but then, as in high north latitudes, its 
rising and falling became irregular and fluctuating during our 
run from latitude 28° S, longitude 27 0 W, (mostly between 
the parallels of 35 0 and 3 6° S, ) until we were in latitude 2 7°S, 
and longitude 51 0 E, on the 11th of July. The mercury then 
began to perform the equatropical motions, and continued 
them uniformly, during our run from the last-mentioned po- 
sition, up the Madagascar Archipelago, across the Equator, 
until our arrival at Bombay July 31st, 1802. 
August 6th, 1802. When the barometers were placed on 
shore in Bombay, the mercury, for the first six days, appeared 
to have a small tendency towards performing the equatropical 
motions, but not equally perceptible as when at sea, the dif- 
ference 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 August to the 22d the mercury 
could not in general be observed to have any inclination to 
perform the equatropical motions, although at times a very 
small tendency towards performing them might be perceived. 
On the 23d of August the barometers were taken from the 
shore to the ship. Immediately on leaving Bombay harbour, 
August 26th, 1802, the mercury in the barometers performed 
