HYD—HYD ge 
No, 307. H DRARGYRI SUB-MURIAS AMMONIATUS, 
Uz. Ss. Ammoniated su mu riate of mercu- 
ry. Hydrargyrum precipitatum album. L. 
Sub-murias Hydrargyri ammoniatum. D. 
Formerly, white precipitate. _ 
Cabinet specimen, Jeff. Coll. No.351. | 
An impalpable snow-white powder, without taste. It is a 
triple compound, of the oxide of mercury 81, muriatic acid 
16, ammonia 3 parts. Insoluble in water and alcohol; does 
not become black, when commingled with lime-water ; 
only used to make an ointment with lard. “ 
Orric. Prev. Ung. hydrargyri precipitati al 
No. 308.—HypDRARGYRUM CUM Crera. L — 
cury with chalk. Sra 
Cabinet specimen, Jeff. Coll. No. 352. 
It is quicksilver, slightly oxydized by rubbing it in a mortar 
with chalk: 3 grains contain one of mercury. Ts a mild 
antacid, and good preparation of mercury; has been used 
in cases of intractable syphilis. Dose, grs.v to 3ss. 
No. 309.—Hyprarerri Nireico-Oxypum. L. & 
U.S. Oxydum Hydrargyri rubrum per aci- 
dum Nitricum. D. Nitric oxyd of mercury, 
called Red Precipitate. . 
Cabinet specimen, Jeff. Coll. No. 353. _ 
An acrid corrosive substance, in small bright-red scales— 
taste acrid and corrosive—is a sub-nitrate of mercury— 
slightly soluble in water ; very soluble in nitric acid, with- 
out effervescence. Used externally. 
Orric. Prev. Unguentum hydrargyri nitrico-oxyd 
D.& U.S. ahaa 
Sophisticated with nimium, which may be detected by di- 
gesting it in acetic acid, and adding sulphuret of ammonia, 
which will throw down a dark-coloured precipitate. To 
be pure, it ought to be entirely volatilized by heat. 
L. E. 
No. 310.—Hyprarcyri Oxypum Cinerevo. L.E. 
 & U.S. Pulvis Hydrargyri Cinereus. D. 
Grey oxide of mercury. _ 
Cabinet specimen, Jeff. Coll. N 
An impalpable grey powder, 
1 r, without taste, fading on expo- 
sure to air and light, As found in the shops, is a mixture 
of the triple salt, consisting of the oxide of mercury, am- 
