278 Meteorological Means. 



The means of the three months, March, April, and May, 

 forming the third quarter of a year, during which I have con- 

 tinued these experiments, are as follow : — 



Pressure of the atmosphere 29-88 



Ditto of the vapour 0.300 



Weight of vapour in a cubic foot 3.346 



Degree of dryness 8 



Evaporation per minute from a surface six inches diameter 0.48 

 Temperature 48|° 



By subdividing, as before, into half-quarters, we obtain, foi 

 the first period, viz., all March and half April, 



Pressure of the atmosphere 29.80 



Ditto of the vapour 0.268 



Weight of vapour in a cubic foot 3.0 1 3 



Degree of dryness 5J 



Evaporation per minute from a surface six inches diameter 0.27 

 Temperature 43° 



For the second period, viz., half April and all May, 



Pressure of the atmosphere 29.95 



Ditto of the vapour 0.333 



Weight of vapour in a cubic foot 3.680 



Degree of dryness lOi 



Evaporation per minute from a surface six inches diameter 0.70 

 Temperature 54° 



