Papers relating to the Fusion of Carbon. Lil 
4]. Strictures by Roser? Hang, M. D. Professor of Chemistry, 
&c. Ge. upon Professor Vanuxem’s Memoir. on Plumbigo, 
Anthracite, fused Carbon &c. published in the Journal of 
the Academy of Natural Sciences, for June 1825. Aliso a 
Letter from Dr Hare to Professor Siruiman, respecting 
some proceedings of the Academy of Natural Sciences. 
Professor Vanuxem, in a letter to Isaac Lea, Esq. which 
has pee lately read before the Academy of Natural Sci- 
ences. endeavours to prove that the fused products obtained 
by Pactinan Silliman, were none of them carbon ;—first, by 
pier fo anthracite and pismbego 3—and secondly, by ex- 
posing t substances, or mahogany charcoal, severally to 
the compound belie: which he was necessitated to use 
im consequence of not having a Deflagrator. 
The analyses thus given are okie 6 so far as they 
may afford correct views of the composition of anthracite 
and plumbago. The only possible “arose which they can. 
have on Professor Silliman’s experiments, is in showin 
what every chemist would have anticipated, especially in 
the case of plumbago, that there may be some ferruginous, 
as well as earthy matter, in the minerals in device: and 
consequently that this matter, when exposed to intense heat, 
may be fused into globules. This result is confirmed by the 
actual production of globules from anthracite, and plumbago, 
on 8 ‘exposure under the compound blowpipe. 
ion, however, of some ingredients in a 
pvc not prove the infusibility of others. If another ingre- 
pei ee to ignition at the same time, be not fused, it 
may show that it was not to be fused under the circum- 
agus of the experiment in eee ‘oe it does not Bie 
pwd _— other circumstances it would be insusceptible of 
The flame of the compound blow te tase necessarily sup- 
ported by oxygen gas, is very unfit ion of char- 
coal, which aie ax exposed to heat and sit ttp anaes off in 
rm of carbonous oxide, or carbonic acid gas ;—but the 
opposite i is true, of the i uition of the Deflagrator, i in pro- 
ducing which oxygen has little or no agency, and with whose 
effects it cannot materially interfere, both on account of the 
excessive rarefaction, and the vapour of carbonaceous matter, 
produced by the extreme heat. 
