&50 GASEOUS BODIES. 



ATOMIC WEIGHT. SP. GRAVITY. 



Sulphuric ether vapour, containing 



4 volumes .... 3-5 . 1-9444 



Naphtha vapour, containing 6 vols. 5-25 . 2'9l66 



The only one> of these five gases not yet de- 

 tected is the first. But it may be looked for 

 among the inflammable gases produced from ve- 

 getable bodies, or from pit coal. 



