Composition of the Gas in non-luminous Flames. 121 
crystalline salts with baryta and lead, and with silver a caseous 
precipitate. Its composition is C4 H'!! N° O!!; and Schiel names 
it chloraluric acid. Besides this, other bodies are formed, the 
investigation of which is not complete. 
The gas in the dark cone of the non-luminous flame of Bun- 
sen’s gas-burner is a mixture of atmospheric air and coal-gas. 
Lunge* has analysed this gas with a view to ascertain the propor- 
tions in which these two constituents exist. To collect the gas, 
the following method was adopted :—In the upper part of the 
burner, a few millimetres below the mouth, a small aperture was 
made through which a fine, bent glass tube was so introduced 
that it stood exactly in the middle of the aperture of the burner, 
and projected about 17 millims. above. The diameter of this 
tube was about 0°3 millim.; it was fastened in the burner by 
means of gypsum, and its other end was connected by means of 
caoutchouc with two wide gas-collecting tubes. The caoutchouc 
junctions could be closed by means of Mohr’s stopcocks. The 
last gas-tube was connected with an aspirator under a constant 
pressure, the efflux of which could be regulated by a tap. 
The flame was so regulated that its height was about 136 mil- 
lims. ; the internal cone was about 61 millims. high. The aspi- 
rator was then set in motion, and a stream of gas withdrawn so 
slowly that the dimensions of the flame were scarcely altered. 
When the tubes were full they were closcd, and transferred to a 
eudiometer. 
The analysis of the gas, made according to the methods de- 
scribed in Bunsen’s gasometric methods, gave the following 
results for the composition of the mixture :— 
Carbonic.acid. “. .'. 0°00 
RVC cet get ee hae 
Pac? Wosa a ccm ie, Lik 
PGCE Ve aie late as eh Adsae) SGA 
Carbonic oxide . . . . 2°73 
Ey aye retinas vein, 6): «-) ep SOG 
Mamleeas 6. 6's %al SIS 97 
INitpOpeT Ns 4. tar ebLOAG5 
100-00 
Earlier analyses of the Heidelberg gas (which was used in this 
investigation), as well as some analyses made simultaneously 
with this research, showed that it contained no oxygen; and 
hence all the oxygen found could be assigned to the atmospheric 
air of the mixture, the quantity of which was accordingly 68:13 
* Liebig’s Annalen, November 1859. 
