"
He concludes his paper thus: "Ce fossile singulier ne paroit pas
appartenir a la Suisse seule. J'ai dans ce moment devant les yeux une
substance parfaitement semblable, si on excepte la couleur qui tient le
milieu entre le gris de fer et le rouge modere; elle vient du pays de
Gotha de la Friedrischs-grube, proche d'Umneau. On le regarde comme un
eisenrahm uni a du charbon de pierre."
The specimen which I have from Stair upon the water of Ayr, so far as I
can understand, perfectly resembles this _plombagine_ of M. Struve. It
consumes very slowly in the fire, and deflagrates like plumbago with
nitre. Now this comes from a regular coal stratum; and what is more
remarkable, in this stratum is contained a true plumbago, Farther up the
country, the Earl of Dumfries has also a mine containing plumbago along
with other coal strata; and though the plumbago of these two mines have
not all the softness and beauty of the mineral of the same species from
Cumberland, they are nevertheless perfect plumbago.
I have a specimen of steatetical whinstone or basaltes from some part of
Cumberland, in which is contained many nodules of the most perfect and
beautiful plumbago.
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