on the Newry pitch- stone, &c. 317 
of its weight. The colour changed to a pitch brown. It 
retained its lustre. It opened, in the manner of cannel coal, 
into thin slaty fragments, but without actually falling in pieces, 
and the interstices acquired a more greasy lustre, and smoother 
appearance, than the rest of the stone. 
The circumstances above detailed, namely, the oily smell 
the disintegration, and the effect of ignition, excited a sus- 
picion that the mineral contained some inflammable sub- 
stance. 
One hundred grains of the compact, in fine powder, were 
exposed to a white heat in a platina crucible, and were con- 
verted into a glass of a very pale leek-green colour, and lost 
ten per cent. 
Two hundred and twenty grains of the same, coarsely 
powdered, were put into a small coated (common bottle glass ) 
retort, to the mouth of which a phial, previously weighed, 
was luted with white lute, and exposed for half an hour to a 
red heat. A colourless liquor came over, which had a slightly 
bituminous smell. The receiver had gained 16 grains, being 
7,2727 per cent. 
The retort breaking, I was not able to ascertain the loss of 
weight of its charge. 
The stone finely powdered, and projected on melted nitre, 
scintillated a little. 
I now proceeded to my analysis, in the usual way, following 
the method of Klaproth, in his analysis of the pitch-stone 
from Meissen ; my view having been, at first, rather to as_ 
certain ingredients, than proportions. 
It may be as well to mention, in this place, the result of 
Klaproth’s analysis. It was 
