270 On the. Gaseous Combinations of ° 
Thus the weight of the constituents found by analysis 
exceeds that of the olefiant gas by about +,th part ;—a clear 
proof that olefiant gas contains no oxygen. The science 
of chemistry, in its present state, admits of no stronger 
roof than what we have now given. 
It follows from the preceding analysis, that olefiant gas 
is composed of about 
Siibor ig SS si. Doe. eee BS 
Hydrogen ..seceeseeeesees 15 
—ey 
100 
Mr. Dalton considers it as composed of an atom of carbon 
and an atom of hydrogen. This comes tolerably near the 
preceding analysis, if we suppose the weight of an atom of 
carbon 4-5, and that of an atom of hydrogen 1. For 85 
is to 15 very nearly as 4°5 13 to 0-8. 
6. There ig a curious experiment, first made by Cruick- 
shanks, and afterwards repeated by Berthollet, which I 
thought it worth while to verify. When olefiant gas is 
mixed with less than its bulk of oxygen, and the mixture 
is fired by electricity, a quantity of charcoal precipitates, 
and the bulk of the residue, after the detonation, 1s much 
greater than before. The following table exhibits the re- 
sult of my experiments im this way : 
- + Me wh 
cS 3 aa ghee Ss 
w So wn wc ag oe 4 
Caee ee ie oo ett 2 o 
35 =i =| is v By A. =) 
nA co» n 7a fet aod rss: 
Sy ~ On = ? Ss Ov = 
we fi, leben eh YS “eke ieee ae 
Zo (ao mo | Ae fea al. & 
bie ao | 28°5 100 94°5 a7 ne te 
2 40 | 30 | 110 | . 
ada a ae a CD : | rae i WA mee BRE ace 
3 40 30 110 
40 29 110 
In each of these experiments, a quantity of charcoal was 
precipitated. It remained long suspended in. the gaseous 
residue, quite dry, and made its escape into the air, if the 
detopating tube was turned up. .I attempted to. ascertain 
the weight of this charcoal, but was not successful. It was 
necessary, in order to collect it on the filter, to moisten it 
in the first place; and it was found impossible to dissipate 
: : the 
bo a 
ST Soh e oes: 
a 
ees 2 
Pipe 
