the several Gusta in the Atmosphere. 251 



II. Table of the prnporlional xx:eights of the 

 different Gases hi a given volinne of Atmo- 

 spheric Air, taken at the Surface qf tki 

 Earth. 



per crrt. 



Azotic gns 75.55 



Oxygenous gas 23.32 



Aqueous vapour 1.03* 



Carbonic acid gas — . 10 



100.00 



111. On the Proportion of Gases at different 

 Elevations, 



M. Berthollet seems to think that the lower 

 strata of the atmosphere ought to contain more 

 oxygen than the upper, because of the greater 

 specific gravity of oxygenous gas, and the 

 slight affinity of the two gases for each pther. 

 (See Annal. dc Chimie, Tom. 34. page 85.) 

 As I am unable to conceive even the possibi- 

 lity of two gases being held together by affi- 

 nity, unless their particles unite so as to iorm 

 one centre of repulsion cut of two or more (in 



* Tl»e propofli)!) of aqueous vapour musl be under- 

 Ktooc} to be variable for any one plate : the others are 

 permanent or nearly so. 



Kk 



