[1042] [Several localities are now known for this peculiar variety of
heavy spar; among others we may mention Amberg in the Upper Palatinate,
and near Osterode in the Harz mountains.]
[1043] Geschichte von Flötz-Gebürgen. Berl. 1756, 8vo.
[1044] Mineral System. Leip. 1762, 8vo.
[1045] Syst. Mineral. 1772, 8vo, i. p. 162.
[1046] [In preparing solar phosphorus from the Bolognian stone, it
should be carefully separated from any contamination of iron or other
heavy metals, formed into a paste as above-described, and exposed to
the heat of a wind-furnace for an hour or two.]
[1047] Fortunii Liceti Litheosphorus, sive de lapide Bononiensi.
Utini 1640, 4to, p. 13. He calls the shoemaker _Casciorolus_, which
seems to be wrong, as Lemery and others write his name _Cascariolo_.
Licetus refers to the letters of Ovidio Montalbani. Epist. var. ad
Eruditos viros de Rebus in Bononiensi tractu indigenus, ut est lapis
Illuminabilis et lapis specularis, calamonastos, &c., Bonon. 1634,
4to. Among the oldest accounts are those in Petri Poterii Pharmacopœia
spagyrica, ii. 27, in Opera, Fran. 1698, 4to. In this work the
alchemist is called _Scipio Bagatellus_, a name which does not occur in
Fantuzzi, Notizie degli scrittori Bolognesi.
[1048] An. 1666, n. 21, p. 375.
[1049] Mémoires des Hommes Illustres.
[1050] Cours de Chymie. Dresd. 1734, 8vo.
[1051] Magnes, p. 481.
[1052] De Igne. Franc. 1688, 4to, p. 350.
[1053] Marggrafs Chymische Schriften, ii. p. 119. This author says the
cakes must be only as thick as the back of a knife; but that which I
obtained in the year 1782 from Bologna, was an inch English measure in
diameter, and two lines in thickness. It still weighs, after the brass
box in which I long preserved it between cotton in a luminous state,
has become black, and itself has lost its virtue, three drachms. In
colour it has a perfect resemblance to the star which Marggraf prepared
from German stones, and presented to Professor Hollman, and which is
now in my possession. It is contained in a capsule of tin plate, over
which a piece of glass is cemented.
[1054] Ferber’s Briefe aus Wälschland, p. 75.
[1055] Polyhist. i. 1, 13, 26, p. 127.