* 
220 E. W. Hilgard on Luminous Flames. 
A later research of Lunge* on the composition of the gas 
contained in the interior cone of the flame of a Bunsen’s bur- 
ner, must have led to the truth of the matter, by showing how 
little oxygen sufficed to render a flame non-luminous when pre- 
viously mingled with the gas. I have not seen Lunge’s me- 
moir ; but he likewise seems to have failed to draw the impor- 
tant conclusion of which his analysis must have contained the 
elements, 
oxygen insufficient to burn more than the carbon to carboni¢ 
oxyd no hydrogen at ll is oxydized ; but that as between car- 
bonic oxyd and hydrogen, the formation of carbonic acid on one 
hand and of water on the other depend upon ‘ chemical mass, 
as Bunsen had already shown, 
This question has therefore been peremptorily ere ie po! 
S i 
cisive experiments, as much as eight years since. 
those which, like the excellent work of Messrs. Eliot and Store, 
There is another point which, though I took special pains to 
go, is still incorrectly 
stated in almost all text-books as well as books of referene® 
T allude to the definition of the several essentially distinct parts 
mportant fourth : | 
ing the base of the flame, which is as sharply defined from the 
rth as from the outer veil with which it is usually 00" 
Pipe oxydation-flame, is stated by Plattner in the first edition 
of his work on the blowpipe. Strangely inconsistent with l's 
* Annalen der Chemie und Pharmacie, vol. exii, p. 205. : 
+ J. pr. Chem., June, 1860, p. 241, er r pe Chem., Dec. 1861, p- ae. 
a 
