in combination with sulphuric acid, exhibiting beautiful crystals and
colours, including sulphate of magnesia from Oregon; sulphate of zinc,
or white vitriol; sulphate of iron, or green vitriol; and the splendid
blue sulphates of copper from Hungary; beautiful sulphates of lead
from Anglesea; sulphates of alumina; common alum; and the splendid
specimens of lazurite, or lapis-lazuli,--

"Blue as the veins o'er the Madonna's breast,"

from which the beautiful pigment called ultramarine is extracted. In
1828 M. Guimet succeeded in making an artificial ultramarine, known
now extensively as French ultramarine, which is little, if at all,
inferior in beauty to lazurite. The next case (56) contains the
Arseniates, including arseniate of lime, crystallised; arseniates of
copper; arseniate of nickel; and red cobalt, or arseniate of cobalt.
The next case is devoted to the Phosphates, or metals mixed with
phosphoric acid, including crystals of the phosphate of iron from
Fernando Po, Bavaria, and Cornwall; phosphates of manganese; phosphate
of copper; yellow and green uranite; phosphates of alumina, including
the blue spar, which has been mistaken for lapis-lazuli, and the
phosphate of alumina known as turquois, found only in Persia, and
esteemed as an ornament. In the two supplemental table cases, 57 A and
B, the visitor may notice specimens of Pyromorphite, a combination of
phosphate and chloride of lead, and a combination of chloride of
calcium with phosphate of lime. These combinations, however, cannot
interest the general visitor.

The case marked 58 contains the varieties of Fluorides, or
combinations of fluorine and the metals. These include the fluoride of
calcium, of which the most familiar variety to Englishmen is that