with which the earth is encrusted. It is nearly pure in the rock
crystal, of which there are many specimens in the first case (20),
including those crystals called Bristol and Gibraltar diamonds,
cairngorms, the smoky topaz; rock crystals inclosing foreign
substances, and in a wrought state: of these Dr. Dee's snow-stone is
one. The next two cases (21, 22) are devoted to the varieties of
common quartz, including the flexible sandstones of Brazil (of which
there are some larger specimens upon a separate table) and to those of
the east; milk quartz; the Salzburg blue quartz, &c.; some varieties
of the cat's eye; hornstones, including wood changed into hornstone:
and herein begin the flints, including some specimens changing into
calcedony, smalt blue calcedony from Transylvania; the Icelandic
stalactical calcedony; and the fine Cornish calcedony. Upon the last
southern table (23) are ranged further varieties of calcedony. These
include the blood stone; the curious Mocha stones; and agates,
including the agate nodule from central Asia. Having sufficiently
examined these beautiful varieties of calcedony, the visitor should
pass at once to the northern range of tables.

Upon the first of these tables (38) are some new scientific varieties
of mineral substances, in which the unscientific visitor will not take
any interest; herein also are Oxides of Antimony, including white
antimony from Bohemia; red antimony, or kermes, not to be mistaken for
the ancient dye used by the old Greek and Roman dyers, which was
obtained from the female _coccus illicis_; and tungstates of lime,
lead, and of iron and manganese.

In the second case (39) are the Molybdates and molybdic acid; the
Chromates, including red lead ore from the Siberian gold mines of
Beresof; chromate of lead and copper, and crome iron from Var, in