43 
here preserved, is certainly not of an osseous na« saloon, 
ture. — The pitchy iron ore of Werner, from Nat~Hi*t. 
Limoges, may be referred to phosphate of 
manganese. — Ores of manganese :— radiated grey 
manganese, from Ihlefeld, &c. some varieties of 
which resemble the radiated antimony in the 
disposition of their acicular crystals ; foliated grey 
manganese ; compact grey manganese of various 
forms, botryoidal, tubercular, reniform, &c. ; 
earthy grey manganese, a remarkable variety of 
which is the black wad of Derbyshire and De- 
vonshire, which has the property of inflaming 
spontaneously when mixed with linseed oil. 
(Case 3/.) In this and the two following cases 
are contained the ores of lead, the most common 
and useful of which is the galena or sulphuret of 
lead : the specimens here deposited include va- 
rious modifications of crystals, detached and 
grouped together, in combination with blende, 
pyrites and many other substances ; galena of 
various grain, massive and disseminated ; galena 
of corroded appearance, decomposed and rege- 
nerated ; the compact and specular variety, call- 
ed slickenside by the Derbyshire miners. — With 
these are also placed specimens of the antirnonial 
sulphuret of lead, or triple sulphuret of lead, 
antimony and copper : this substance has been 
m 2 called 
