254 Scientific Intelligence. 
It is recognized by the following reactions: 1st, Potassic hydrate 
deprives the gas or its watery solution, at once, of its 
monia. 4th, Iodid of starch is decolorized in a short time by this 
gas.— Ann. Ch. Pharm., Suppl., Band V, 236, Oct. 1867. 4 
¥, 
im a current of steam, producing HCl and Na,€r@,. The mass 
is drawn from the fire, mixed with charcoal and again heated; by 
which Na, €6, and €r,0@, are produced. The sodic carbonate is 
extracted with water, and crystallized. The chromic oxyd is ready 
for a new operation.— Bull. ‘Ch. Soc., IL, Vili, 299, Oct. 1867. 
G. ¥. B 
7. AUotropic states of Metallic Arsenic—When arsenicum is 
_ sublimed in a stream of hy gas, there is obtained, beside 
het sublimate of hexagonal crystals, having a metallic luster, a 
When pure arsenicum is sublimed in a quick stream of hydrogen 
gas, the hexagonal Mei 4 is deposited nearest to the heated part 
of the tube, next amorphou is thrown _ 
and it is easily oxydized by 
passes rapidly into the gray. 
e amorphous glassy black arsenicum is obtained when the 
vapor is cooled to 210° or 220°C. It is readily procured in crusts 
5 or 6 millimeters thick, by subliming the metal in a stream 0 
: hydrogen, through a tube, one portion of which is bent in a U 
a 7 
dilute nitric acid being without action u nit. It constitutes the 
arsenical mirror the Marsh test. eS . 
The density of the hexagonal variety was found to be in three 
ecimens prepared by different methods 5°728, 5°726, 5°727 at 14 
J.— Ann. Ch. Pharm., exliv, 110, Oct., 1867. 6. FB 
8. Metallic Cerium.—W sure has recently prepared this metal 
