Experiments on the Gas from Coal. 427 
sumes a double volume of oxygen. In this 
case and a variety of similar ones, we can 
only at present explain the phenomena, by 
comparing them with hypothetical mixtures 
of the different known gases. As an ex- 
ample, I shall describe the particulars of 
the combustion of the first product of Clifton 
coal, and endeavour to explain the results in 
the manner which has been suggested. 
Measures of the gas...... 11 
Mixed with oxygen........ 39=37 pure oxygen-+-2 azote. 
Total...... 50 
Volume after firing...... ee! 
do.after washing by potash 21 =19 oxygen-+-2 azote. 
18 oxygen consumed. 
In this case, the diminution by firing is 19 
measures ; that by potash, which denotes the 
carbonic acid, 10 measures; and the gases 
consumed are 11+18=29. Let us examine 
what mixture of gases will account for the 
appearances. 
m. of infl,Gas.” Take Oxyg, Give Carb. Acid, Diminution 
y firing 
1.1 Olefiant...... EB SP SPA See Bis tie <i ete aiaela 2.2 
Bie OBE, VOR > oan ES sae N cs s.cie™ vac o 7h aR RISA BASSAS 14. 
is Garb. oxide 20. 5.22). 53 OSs . Ate oat Es 
a Hydrogen. sco. 1... wewieccanccdesaenicncececese 3. 
8 a | : 18.8 9.7 20.2 
