76 natural history. (Minerals.) [north 
taken for arragonite. The remaining part of this Case is occupied by 
such specimens of the mineral species called arragonite as have partly 
been found to contain a few per cent, of carbonate of strontia : they 
are, however, essentially carbonates of lime, though of a different crystal 
system the tarnowitzite is a plumbiferous variety. Among the more 
interesting of the regular forms of arragonite here deposited are the loose 
and variously grouped simple and hemitrope crystals from Arragon, 
and from Herrengrund, in Hungary, Kosel, Bohemia, &c., and the 
fine acicularly crystallized varieties, in brown iron-stone, from Ilefeld, 
in volcanic ejections of Vesuvius, &c. : they are continued in 
Case 42, in which are also placed several very perfect specimens of 
the coralloidal variety of arragonite from Eisenertz in Stiria, and 
Hiittenberg in Carinthia, formerly called flosferri, &c. : to the massive 
varieties of this species some of the calcareous deposits of Carlsbad in 
Bohemia may be referred. The remainder of the Case contains 
several striking varieties of common carbonate of lime or calcite , 
some of which" have been mistaken for arragonite. 
Cases 43 to 45 contain crystallized varieties of calcite. Among 
the specimens placed in the first of these Table Cases may be speci- 
fied those illustrative of double refraction, cleavage, supernumerary 
joints, colour, &c. ; likewise the various secondary obtuse and acute rhom- 
bohedrons; among the former of which the most common, but not the least 
striking, is the inverse variety of Haliy, so called from its being as it 
were an inversion of the primitive rhombohedron of calcareous spar ; 
and the same with a considerable admixture of quartz, commonly called 
crystallized sandstone of Fontainbleau, &c. ; also many interesting and 
beautiful specimens, from the Hartz, Derbyshire, &c., of prismatic and 
pyramidal modifications of the same substance. . 
Case 45. Besides additional chiefly prismatic modifications of crys- 
tallized calcite, this Table Case contains several belonging to the sta- 
lactic and fibrous varieties of that substance, the most characteristic 
of which latter are those from Cumberland and Sweden, with pearly 
lustre (which has obtained for the former the appellation of satin-spar), 
and that in coloured layers from Africa. 
Cases 45 A and 45 B are set apart for polished specimens of such 
granular, compact and fibrous varieties of calcite as are familiarly known 
by the appellation of marbles , and of those that bear the name of ala- 
baster in common with the finer varieties of sulphate of lime. Among 
the varieties of shell limestone in Table Case A., the most 
esteemed for ornamental purposes is the Carinthian lumachella, or fire 
m Case 46 contains the remaining varieties of calcite, among which 
may be particularized the well-known depositions from the hot springs 
of J Carlsbad in Bohemia, particularly the pisiform limestone, or 
pea-stone , as also the globular variety (considered by some as 
magnesian limestone) found in the bed of a small river near Tivoli, 
and known by the name of Confetti di Tivoli roestone the tufaceous 
limestone , in "porous, spongy, cellular, tubular and other imitative forms, 
as incrustation on various objects, such as on the human skull here de- 
posited, which was found in the Tiber at Rome ; calcareous deposition 
formed in a square pipe in a coal mine in Somersetshire * ; casts made at 
* The slab of the table in the middle of the room is composed of a stalagmitic 
