ARSINA

(Lat.), n. f. ’na3, The botanical genus Curcuma. [B, 121.] (Bl See Black-ToNGUE. Ger., Arsid. Arsidogen. [B, 140, See Arthis sul nce in which 1, 2, or 3 atoms of hydrogen are replaced by elements or radicles. The a's in thig sense are analogous in structure to the amines and are similarly cla ed as primary, seconde and tertiary a’s. The primary a's, of the general formula AsR’H,, exist only in combination; the secondary a's, AsR’’H, exist by themselves with a doubled molecular formula, AsgR’’,H, constituting the cla of compounds known as cacodyls; and the tertiary a’s, ASR/”, are known in the free state. [B.] See also Tri- ETHYL ARSINE, TRIMETHYL ARSINE, and CACODYL.