21 
Saxony, derived from modifications of calcareous 
spar, are generally referred to conchoidal horn- 
stone ; also some beautiful specimens of w'ood 
converted into hornstone, being the woodstone 
of Werner. 
(Case 9-) In this case are deposited the dif¬ 
ferent varieties or subspecies of jasper, such as 
they are enumerated by Werner, viz. the Egyp¬ 
tian or globular jasper, found ehiefly near Cairo 
in rounded pieees, which appear not to owe their 
form to rolling, but to he original and produced 
by infiltration ; the ribbond-jasper, or striped 
Jasper, the finest varieties of which are found in 
Siberia; the variously tinted common jasper; 
the agate jasper, found only in agate veins ; the 
Porcelain jasper, which is produced by the agency 
of subterraneous fire.—In this case are also con¬ 
tained the substanees eonstituting the obsidian 
tribe, to which belong the pitch-stone, which is 
often confounded with semi-opal;—the pearl- 
stone, so called from its colour and the small 
globular concretions of which it is composed; 
—the'obsidian, a remarkable variety of which is 
that found in globulai'^aieces, at Ociiotsk in Si¬ 
beria, near the small river Marekanka, from 
which it has obtained the name of Marekanite; 
—pumice, which is not always of volcanic origin. 
Near these substances are placed some specimens’ 
SALOON 
Nat. Hist 
I 
Oi 
