102 Expériments: on Anthracite, Plumbago, §. 
é 
ee Experiments on Anthracite, AE dort ge. By 
aha Sganscn Band d March 15, 1825.° : 
hay 
“y “5 
oe * a 
eoraile” experiments were undertaken. with aview to 
dbtertdine ‘whether the globules obtained by Professor 
Silliman, from the above substances, were owing to a fusion 
of their: carbon, or merely to the impurities or foreign matter 
contained within them. ‘They were long near by my 
waiting for some sheet zine necessary to repair a Deflagrator 
. intended to be used for the, purpose of obtaining the globules ; 
but this not arriving, | resolved to avail myself of the sugges- 
tion of Professor Silliman, namely, that of using the com- 
pound blowpipe which answered perfectly well. In the ex- 
periments with the blowpipe, the substances were placed 
upon platina foil, spread upon a Jump of magnesia ; the size 
of the pieces subjected to its action, was about 5 an inch in 
diameter, pad 1 of an inch in thickness, The. light. 
num instances, was so. intense, that fo 
necessary t to A double green paises. met 
‘The mode mode pursued in the analysis of Anthracite and Plum- 
ag ) was as follows. he presence of water was ascertained 
_ by heating a few small pieces of the substance in a glass 
tube, closed at one end; and the quantity of water by heating 
a given portion in a covered platina crucible. Another por- 
tion was pulverized in an agate mortar; then.a given weight 
of it.was put into a platina crucible, and kept without its 
cover at a red heat in a small French furnace, at the whole 
0 carbon was consumed ; the residue was then boiled in 
water for an alkali; after this operation it was heated with 
caustic potash in a silver crucible: when the fusion of the 
mass was completed, water was added, and the whole then 
dissolved with nitro-muriatic acid. By evaporati ing. the li- 
1 to dryness, and adding ESE g water and filtering, 
ilex was obtained. To the liquor from this operation, 
ammonia in excess was added, and by this agent, the iron, 
BISnERACA, and aipenine, contained in the liquor, were precip- 
es 
aa the Journal of the Academy of Natural Sciences of Phil- 
a 
