Meteorological Observations, 667 
equal distances over the surface of the globe, and 
cotemporary observations made on them for a 
year or more, we should then probably be in 
possession of facts from which a rational theory 
of the variation of the barometer might be de- 
rived: Observations made in different parts of 
the same province or country seem not now of 
much importance in this respect, 
Observations on the Thermometer, made at Man- 
chester, for 1801. 
Mean. { Highest. } Lowest, 
Jan. | °39°-3 | 52° | 23° 
Heb: 39-4] 52 28 
Mar. } 42 57 27 
\ April | 46.5 | 68 28 
May | 51.9] 67 38 
June | 56.3] 73 | 40 
pay | 8") 
Aug. | 62.1 | 80 53 
Sept. | 56 67 AT 
Oct. 49.2} 60 35 
Nov. | 39.6 | 54 26 
Dec. | 34.6] 45 20 
Mean | 48 
_ 
The observations were made three times a 
day ; namely about 8 A. M. and 1 and 11 P. M. 
The mean obtained from them is probably be- 
low the true mean temperature, 
* The observations in July were interrupted, 
