This historic book may have numerous typos and missing text.
Purchasers can download a free scanned copy of the original book
(without typos) from the publisher. Not indexed. Not illustrated.
1805 Excerpt: ...gravity 2--33; hard as jasper nearly. Melts at 151
of Wedgwood into a spongy and semi-transparent mass. In this
substance fire in the earth has begun ta glaze, or slightly vitrify
its surface, like pottery over-baked. Heliotrope.--Specific gravity
from 2 fJ2 to 2--7. At-114 of Wedgwood grows-brown. Hello8 From
Egypt, Iceland, and Siberia comes; Rich in green shades with spots
of red, and no With ochre-yellow; by heat degenerates To reddish
brown, hut scarce is fused With aid of oxygene.------. SPECIES
XXXIV. Wood-Stone, bois Petrifie, Holzstein, Lithoxylon. Lithoxylon
in Martinique abounds, And varies as the wood it represents.
SPECIES XXXV.--Felspar. Felspar with varied tints abounds; flesh
red And grey, but scarcely ever black is found, trope is bloody
jasper-quartz, and distinguishable from agate-quartz of a
dark-green, dotted with red, by its opacity, since the agate-quarte
with a similar face is transparent. Petrified Wood is agate-quartz,
or wood incrusted. Quartz sometimes incrusts foreign substances,
and particularly the dog's tooth calcareous spar, the metastatique
of Hauy, and dent de cochon of De Lisle. Felspar.--The essential
character is in its natural joints equally distinct, in two
directions, perpenAnd rarely blue, or green. Transparent now With
pearly hue, and iridescent rays, And now opaque; in fracture
foliate, In crystals tetrahedrally disposed, Obliquely truncate,
and in rhomboids forra'd. dicular the one upon the other. Spec.
grav. 2--4378 to 2--7045. Cuts glass, and sparkles when struck
against the steel; has a double refraction when cut into facets;
very little electricity, and some phosphorescence, if rubbed one
piece against another in the dark. According to Kirwan, any
compound of silex and alumine, in which silex prevails, with l...
|Country of origin:
||246 x 189 x 2mm (L x W x T)
||Paperback - Trade
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