ARG—ARS | 59 
root, in f3xij of boiling water, and straining through mus- 
lin, Ryd acer a nae ‘three or four 
times a day—of the powdered root, grs. v. to grs. x. 
No. 78.—ARGEMONE Mexicana. L. Brumadundoo 
of East India. - 
Class, Polyandria. Ord. Monogynia. Nat. ord. Linn. Rhe- 
Cabinet specimen, Jeff. Coll. No. 93—coloured figure of the 
plant, No. 94. 
Native of Mexico, Jamaica, the Caribbee Islands, and India. 
The bitter yellow juice of this thorny plant (culti- 
vated in ‘most of the : a Uni 
No. 79.—Arsenicum Arsum. (Acidum Arsenio- 
= ae eydum Arsenici. E. Arsenict Oxy- 
_Arsenicum. D. Acidum Arsenio- 
S. White Arsenic. Arsenious 
Arsenic. eae ae 
ficinal name. Cee ® 
' Cabinet specimens, Nos. 95, 96, 97, 98. 
Obtained in Bohemia and Saxony, in roasting the cobalt ores, 
in making zaffre, and sometimes by sublimation from ar- 
senical pyrites. The roasting is performed in furnaces 
with long flues, in which the impure oxyde is condensed. 
This is purified by sublimation—performed by putting 
large quantities of impure arsenic into heated cast-iron 
__ boxes, of a square form, with conical heads luted with 
Clay. When the oxyde has been sublimed in these heads, 
_ they are separated, and the oxyde is struck off. The ar- 
semous acid, thus obtained, is a dense, semi-transparent, - 
solid cake, which becomes opaque; of a snowy whiteness; 
