J. L. Smith on flame heat in the Chemical Laboratory. 341 
The soluble part consists principally of olivine. The insol- 
uble is doubtless the bronzite already refer to, with a little 
albite or oligoclase. 
Chrome tron was detected by fusing some of the stony part 
of the meteorite with carbonate of soda and a little niter, and 
separating in the usual way. The quantity was quite minute. 
e composition of the stone as made out would be 
Dickéltiereis WOM. .s. ss 6s. se ase eee 7°00 
Mapnetie pyrite’: iscr. oe a. Ses 6°10 
Bronzite, or hornblende 72 6. os 8 
Olives 1) SEO RS WAAL : 
Albite, or oligothate 1000s 68 i vies BS, + 86 e 
Chrothe trots: 3st tags om Be cas Bo J 
100°00 
Art. XXXIV.—Some practical remarks on the use of Flame Heat 
in the Chemical Laboratory, especially that from burning gas 
without the aid of a blast; by J. Lawrence Situ, Louis- 
ville, Ky. 
THERE is probably no more important era in the operations 
of the chemical laboratory than that of the introduction of the 
mp as a source of heat for a large number of chemical opera- 
tions, and that without the aid of a blast. Berzelius was doubt- 
less the first to accomplish much in this direction, which he did 
by the agency of the lamp that so.commonly bears his name, 
and whi 
which, more or less modified, is still in use where the ordi- 
nary illuminating gas is not to be had. 
_ Although illuminating gas has been in use for about seventy 
sna it is only within a comparatively recent date that it has 
een pressed into service, and used as a heating agent in the 
rato 
y adopted. 
We must date the successful introduction of gas for eee 
purposes to the use of a mixture of gas and air ar hts. 
wire gauze and ignited above the gauze, giving a flame withou 
light and with ‘ek heat; the canon of this method is 
