45 
in the disposition of their acieular crystals ; foliated 
grey manganese: compact grey manganese of va¬ 
rious forms, botryoidal, tubercular, reniform, &c. ; 
earthy grey manganese, a remarkable variety of 
which is the black wad of Derbyshire and Devon¬ 
shire, which has the property of inflaming sponta¬ 
neously when mixed with linseed oil,— Silicate of 
manganese. &c. 
{Case 41.) In this and the two following cases 
are contained the ores of lead, the most common 
and useful of which is the sidphuret of lead, or ga¬ 
lena: the specimens here deposited include various 
modifications of crystals, detached, and grouped to¬ 
gether, in combination with blende, pyrites, and 
many other substances; galena of various grain, 
massive and disseminated ; galena of corroded ap¬ 
pearance, decomposed and regenerated; the com¬ 
pact and specular variety, called slickenside by the 
Derbyshire miners.—With these is also placed the 
antinionial sidphuret of lead, or triple sulphuret of 
lead, antimony, and copper, called Endellion by 
Count Bournon. [See British Collection : Corn¬ 
wall.] 
{Case 42.) Ores of lead continued:—the more 
prominent specimens in this case are those of car¬ 
bonate of lead, or white lead, among which may be 
particularized the laminar varieties, the beautiful 
modifications from Siberia, and the crystallized aci- 
cular white lead from the Hartz, accompanied with 
SALOON. 
Nat. Hist. 
green 
