122 ; M. Lourengo on Glycol. 
per cent. There remains, therefore, 31°78 per cent. gas of the 
following composition :— 
Carbonicacid . . . . 0:00 
PENG leis eet UU 
Hayle 47.008 8 ss | ORS 
Ditetiylé. isis he a BB 
Carbonic oxide . . . 8:58 
Hydrogen. 1 s « + . 87°46 
Marsh-gas . . . . » 40°70 
Nitrogen. « « + « + 5°64 
100:00 
This composition agrees with other analyses of Heidelberg gas, 
and from it may be calculated the quantity of oxygen (i. e. air) 
necessary for the perfect combustion of the gas which must reach 
it from the outside. For— 
1:67 vol. Elayle requires. . 5:01 vol. oxygen. 
0:76 ,, Ditetryle _,, . 456 os 
2°73 ,, Carbonic oxide. . 1°37 * 
1194 ,, Hydrogen ,, . . 5:97 5 
12°97 ,, Marsh-gas ,, . . 25°94 * 
42°85 
From this it appears that 100 parts of this gas mixture still 
require 42°85 — 14°28 =28°57 parts of oxygen, which correspond 
to 136°30 parts of air. Hence in the flame of this burner, almost 
exactly one-third of the oxygen (7. e. air) necessary for complete 
combustion reaches it from the interior. 
Lunge has also calculated, according to the methods described 
in Bunsen’s work, the temperature of the flame for this gas. He 
finds that it is 2781° C. 
In the expectation of forming oxide of ethylene* directly from 
glycol in accordance with the following equation, Lourengo + 
heated together glycol and bromide of ethylene : 
4 
€ a + CH Bre=2 (© u f° +202 H10+2H20, 
Glycol. Bromide of Oxide of 
ethylene. ethylene. 
Hydr hah 
glycol. 
Hydrobromic glycol and water were formed; but instead of 
oxide of ethylene, a substance is obtained boiling above 230° C., 
having a sweet taste, the consistence of glycerine, and perfectly 
* Phil. Mag. vol. xvii. p. 427. 
{+ Bulletin de la Soe. Dbicsigue, Ds ide 
{ €=12; 6=16; C=6; O=8. 
