450 
Mr. Faraday on new compounds 
has combined with the hydrogen to form water, and which 
with the 0.34 of vapour nearly make the diminution of 0.9. 
It will be seen at once that the oxygen required for the 
carbon is four times that for the hydrogen; and that the 
whole statement is but little different from the following 
theoretical one, deduced partly from the former experiments, 
1 volume of vapour requires 7.5 volumes of oxygen for its 
combustion ; 6 of the latter combine with carbon to form 
6 of carbonic acid, and the 1.5 remaining combine with 
hydrogen to form water. The hydrogen present therefore 
in this compound is equivalent to s volumes, though con- 
densed into one volume in union with the carbon ; and of the 
latter elements there are present six proportionals, or 36 by 
weight, A volume therefore of the substance in vapour 
contains 
Carbon - 6 x 6 = 36 
Hydrogen - 1x3=3 
39 
and its weight or specific gravity will be 39, hydrogen 
being 1 . Other experiments of oqi same kind gave results 
according with these. 
Among the liquid products obtained from the original 
fluid was one which, procured as before mentioned, by sub- 
mitting to 0° the portion distilling over at 180® or 190°, 
corresponded with the substance already described, as to 
boiling points, but differed from it in remaining fluid at low 
temperatures ; and I was desirous of comparing the two 
together. I had no means of separating this body from the 
