( VII ) 
Weight of Vapour 111 
a Cubic Foot of Air. 
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Klastic Force 
of Vapour. 
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Temperature of 
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Diff. from 
average of 
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1877. 
Months. 
July .. •• 
August . . 
September 
CO 
a 
C3 
October 
November . . 
December .. 
OS 
a 
d 
<o 
