i12 Papers relating to the Fusion of Carbon. 
The hg of plumbago by the Saat was readily effected 
e than twenty years-ago, as be seen in my 
memoir on the supply and apitication’ of the blowpipe. 
The same result was subsequently accomplished by Pro- 
fessor Silliman, and now agreeably to the memoir before us, 
by Professor Vanuxem himself. According to the analysis 
tie in this memoir, in which plumbago is thus admit- 
to be fusible, it differs from carbon only in containing 
it was re resented as a paedaek of mahogany charcoal.® 
Esoleease , acs has not as yet acknowledged himself, or 
' Macneven, to have fallen into any error 10 treating 
‘pelea iron as a possible extemporancous product y 
ieee He has not even done me the honour of 
the ecard in which it was demogstesttd that in so 
ng it he had made a mistake. We are of course to 
aibat he still adheres to the position that wood charcoal 
ey yield, during a transient. exposure to ignition, a globule 
of iron in its metallic form. - Under these circumstances, it 
must surprise every reader, that he does not by an analysis of 
ma ogeny charcoal, eadany Om to prove that iron exists in it 
en an ee 
* Professor Macne Macneven has amend stated the same fact, in conyers? 
tion with the editor, Septemhe 
