540 ARSENIC. ably powerful, the term was especially applied to that orm o it which was most commonly met with. The arsenic of commerce of the present day is in some instan ces of a yellow colour, owing to its containing a portion oi sulphur.—Kul, Min. v. ii, p. 20G, 207. 4. Oxide of Arsenic. Arsenikbluthe, Karsten. Arsenic oxyde, Ham/, t. iv. p. 225—Arsenikbluthe, Reuss, b iv. s. 523. Id. Karsten, Tabel. s. 7-1—Arsenic oxyde, Hamj, Tabl. p. 108. Id. Lucas, t. ii. p. 447—Arsenikbiiithe, Ilaus. Handb. b. iii. s. 805. It is divided into three subspecies, viz. Common, Ca pillary, and Earthy. First Subspecies. Common Oxide of Arsenic. Gemeine Arsenikbluthe, Hausmann. Id. Ilaus. Handb. b. iii. s. 805. External Characters. . ItS C0l0U1 i S "now-white or milk-white, and some times tinged accidentally reddish, yellowish, or green- _ It occurs in crystalline or stalactitic crusts ; sometimes in small, adhering, tabular or prismatic crystals. Internally