666 
‘METEOROLOGICAL OBSERVATIONS. 
BY JOHN DALTON. | 
Observations on the Barometer, made at Manchester, 
_ for 1801. 
Mean. Highest. Lowest, 
Jan. 29.59 30.05 28.98 | 
Feb. 29-56 30.02 28.87 
Mar. 29.61 30.20 | 2868 
April | 29.86 30.20. | 29.10 
May -| 29.65 30.00 29-20 
June 29.88 30.11 29-53 
July 29.65 30.10 | 29.13 
Aug. 29.88 30.15 | 29.42 
Sept. 29-73 30.12 29.11 
Oct. 29.62 | 30.15 28.73 
Nov. 29.55 30.07 | 28.68 
Dec. 29.29 39.00 28.54 
29.66 | Mean for the year, 
The observations were made three times a 
day. | 
It is now well known that the fluctuations of 
the barometer are not local, but extend over a 
considerable portion of the earth: the extremes, 
whether high or low, usually take place on the 
same day in Great Britain, France, Germany, 
and Russia, and seldom differ more than one day. 
If a number of barometers were stationed at 
