low-^oo — 6©66©6 

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Amount of rain. 



Temperature of dew point. 



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Temperature of the air. 



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Pressure of the atmosphere. 



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weight of a cubic foot 

 of air. 



Mean whole amount of water 



in a vertical column of 



atmosphere. 



Mean degree of humidity. 

 (Complete saturation = 1 .) 



Mean additional weight of vapour 



required to saturate a 



cubic foot of ail'. 



Mean weight of vapour in a 

 cubic foot of air. 



Mean elastic force of vapour, 



or mean amount of water mixed 



with the air. 



Mean temperature of dew point. 



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strength, to 6. 



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