44 
saloon, resemble the radiated antimony in the disposition 
nat7i?ist. °f their acicular crystals ; foliated grey manga¬ 
nese : 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 Devonshire, which 
has the property of inflaming spontaneously when 
mixed with linseed oil,, 
{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 gar 
lena ; the specimens here deposited include various 
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 regenerated ; the 
compact and specular variety, called slickenside 
by the Derbyshire miners,—With these is also 
placed the antimonial sulphuret of lead , or triple 
sulphuret of lead, antimony, and copper: this 
substance has been called endellion by the Comte 
de Bournon, and bournonite by Professor Jame¬ 
son. 
{Case 42.) Ores of lead continued the more 
prominent specimens in this case are those of 
carbonate of lead , or white lead, among which may 
be particularized the laminar varieties, the beauti¬ 
ful modifications from Siberia, and the crystallized 
acicular white lead from the Hartz, accompanied 
with 
