64 COMBINATION OF GASES BY VOLUME. 



Vols. or cubic inches. Cubic inches. Vols. 



100 Cy. combine 100 H to form Cy. H 200 Hydrocyanic acid 



100 Cy 100 Cl Cy. Cl. 200 Cyan u ret of chlorine 



100 Cy 100 I Cy. I 200 Cyanuret of iodine 



200 N 200 O N 400 Binoxide of nitr. 



25 P 100 H PH lOOPhosphurettedhyd. 



16 Sulphur vap. 100 H S H 100 Sulphuretted do. 



16 S do. 200 O S 200 Sulphurous acid 



16 S. . .. do. 3000 S 200 Sulphuric acid 



By glancing over the above Table, we perceive 

 that the aggregate volume of the 1 8 first gases and 

 vapours, down to aether, is reduced during che- 

 mical combination from 3 to 2, 4 to 2, 3 to 1 , 4 to 1 , 

 (as in olefiant gas) from 8 to 1 , as in aetherine 

 from 9 to 1, in Faraday's bicarburet of hydro- 

 gen from 11 to 1 , in naptha vapourand from 

 14 and 1 9 to 1 , as in napthalin and paranapthlin 

 in all of which, the specific gravity and atomic 

 weight are the same. 



The next class of gases and vapours in the '2nd 

 department of the Table, unite chemically with- 

 out any change of volume, such as chlorine and 

 hydrogen, to form hydrochloric acid gas, the 

 specific gravity of which is a mean of its consti- 

 tuents, and so of the other six gases and va- 

 pours, including binoxide of nitrogen in all of 

 which the specific gravity represents only one 

 half of their atomic weights. 



