[ 35° ] 



Table of the Ratios of the ^anti'ti'es of Vapour at different baromc' 

 metrical Heights, the Sluantity at the Surface of the Earth being 

 given. 



Thus in the example laft quoted, the quantity of vapour in a "^* 

 cubic foot at Geneva being 10 grai.is, barometer 28,77, the 



quantity 



