of the native Cinnabars of Japan, Sc. 147 
The transverse fracture is scaly, the longitudinal one la- 
mellated. 
The fragments are irregularly angular and opake. Pyri- 
tous points are partly scattered over them, or rather they 
adhere to a quartzy matrix. The mineral is tender; its 
powder is of a scarlet colour; its specific gravity is 7°710. 
A. 1000 grains were sublimed in a retort furnished with 
a globular receiver, in which a little water was put. The 
produce sublimed was exactly similar to artificial cinnabar. 
The water of the receiver, rendered turbid by some parts of 
sulphur, contained sulphuretted hydrogen gas and sulphu- 
rous acid in small quantity. The residue in the retort, 
weighing 38 grains, being digested with muniatic acid, the 
latter took up the iron coming from the pyrites and left the 
guarizy matrix. 
B. a. 104 grains of mineral, which according to the above 
experiment contained 100 grains of cinnabar, were heated 
with 500 grains of muriatic acid, which disengaged from it 
sulphuretted hydrogen gas. 100 grains of nitric acid were 
‘successively added, which produced, with lively efferves- 
‘cence, the decomposition of the cinnabar, and the complete 
solntion of the metallic parts. 
b. The sulphur remaining, of a grayish yellow, had a 
viscous consistence; it weighed 11°8 grains. When burnt 
it left a blackish residue of 1°5 grains, which deducted from 
the preceding weight determines the quantity of sulphur at 
10°3 grains. 
c. The solution of cinnabar in nitro-muriatic acid was 
mixed with muriate of barytes. The precipitate, after hav- 
ing been made red hot, presented 30 grains of sulphate 
of barytes, which correspond with 4-2 grains of sulphur. 
. Besides these 14°5 grains of sulphur, we may count a quarter 
of a grain of loss by the sulphuretted hydrogen gas ; whence 
it results that 100 parts of pure cinnabar contain 14°75 of 
sulphur. 
C. 1040 grains of cinnabar, which contain, according to 
the above experiment, 1000 grains of pure cinnabar, were 
distilled with half the weight of iron filings; the produce 
K 2 was 
