Anthracite of the Calton Hill. 337 
appeared in Erdmann’s Journal der Chemie, 1835, 4th Bd., 
p. 393. By a careful observer like Lampadius, the presence 
of sulphur and nitrogen in anthracite was not overlooked. 
He likewise examined all the products of its dry distillation, 
and obtained, besides water, a mixture of gases, which con- 
sisted of carbonic acid, carburetted hydrogen, carbonic oxide, 
and nitrogen. 
Similar results were obtained on analysis of two varieties 
of anthracite from North America, which Professor Brei- 
thaupt of Freiberg procured for him. These samples, from 
Manchchunk in North America, and from Rhode Island, are 
described by Professor Breithaupt as remarkably fine an- 
thracite. The imperfections of the analytical methods at 
that time, however, led Lampadius to draw false conclusions 
from his analytical results, and induced him to consider all 
anthracites as hydrates; but we know at present that the 
hydrogen and oxygen in anthracite are not united as water. 
Though mistaken in his quantitative analyses, Lampadius, 
nevertheless, has the credit of having pointed out the quali- 
tative composition of several varieties of anthracite more ac- 
eurately than any chemist who examined this mineral before 
him. In all samples he detected carbon, oxygen, hydrogen, 
nitrogen, and sulphur, besides the ash, or the same substances 
which were found to enter into the composition of the anthra- 
cite of the Calton Hill. 
On the Possible Derivation of the Diamond from Anthracite and 
Graphite. By Dr GzorGE WILson, F.R.S.E.* Commu- 
nicated by the Author. 
The recent analysis by Dr Voelcker of the anthracite of 
the Calton Hill, which some mineralogists had thought en- 
titled to the name of carbon, as not sensibly differing from 
graphite, led me, though dissenting from that view, to spe- 
* Rend before the Royal Society of Edinburgh, 4th March 1850. 
VOL, XLVILI. NO. XCVI.—APRIL 1850. ¥ 
