gaseous mixtures , and its application to their analysis. 289 
varying with the quantity of gas to be submitted to experi- 
ment, which may be from half a cubic inch to a cubic inch or 
more. These, when in use, may be immersed in a small iron 
cistern containing mercury, and provided with a cover in 
which are two holes, one for the tube, and the other for the 
stem of a thermometer, the degrees of which are best en- 
graved on the glass. 
By means of these improved modes of analysis, I have 
already obtained some interesting illustrations of the nature 
of the gases from coal and from oil. I reserve, however, the 
communication of them, till I have had an opportunity of 
pursuing the enquiry to a greater extent, and especially of 
satisfying myself respecting the exact nature of the compound 
of charcoal and hydrogen, discovered some years ago by 
Mr. Dalton, in oil gas and coal gas, which agrees with 
olefiant gas in being condensible by chlorine, but differs from 
it in affording more carbonic acid and consuming more 
oxygen. 
Manchester , 6 th June, 1824. 
mdcccxxiv. 
Pp 
