Peessure or Aqueous Vapour. 



413 



Pressure op Aqueous Vapour. 



TABLE X. — Daily, Weekly, and Monthly Means of the Pressure of Aqueous Vapour, in inches of 

 Mercury, as deduced from Tables I. and VII. 



Annual Variation of the Pressure of Aqueous Vapour. — This variation follows the same law as that of 

 the temperature of the air. The pressure is a maximum in July and a minimum in February and December. 

 The means for the meteorological seasons are — 



Winter, Dec, Jan., Feb., 0-195 

 Spring, March, April, May, 0-247 



Summer, June, July, Aug. 0359 

 Autumn, Sept., Oct., Nov. 0-294 



The mean pressure of aqueous vapour for the year 1844 =:= 0'274 in. 



MAG. AND MET. OBS. 1844. 



5 u 



