niCTIONARY OF THE ACTIVE PRINCIPLES OP PLANTS. 



101 



[Potassium sulphocyanide, if concentrated.] 



silver potassium cyanide, amorphous 1 in 3,000 to 0,000. 



Chromic acid (.') per cent., solution). 



Potassium bichromate, at 1 in 3,000, gradually. 



Phospho-raolybdic acid (cloud at 1 in .'),000). 



„ antimonic acid, 1 in 1,000, dirty flocks ; cloud at 1 in 5,000. 

 lodo-potassic iodide, kermes coloured pp. 

 [Bismuth-potassic iodide, not dilute.] 

 Cadniium-potassic iodide, completely. 

 [Zinc-potassic iodide, very slight pp.] 



ivlercuric-potassic iodide, yellowish-white pp. ; cloud at 1 in 5,000. 

 Mercuric chloride, pp., but not 1 in 500 ; the double salt has M.P. 172°. 

 Chlorine water, yellow coloration ; golden with ammonia. 

 Bromine water, cloud at 1 in 5,000. 

 Colour tests : 



Concentrated sulphuric acid, yellow, changing to carmine. 



„ ,, „ with potass, bichromate, reddish-brown. 



„ ,, ,, with sugar, gradually deep greed, then 



deep blue (characteristic, Weppen). 

 Concentrated sulphuric acid with nitric acid, cherry red. 



., nitric acid, yellow. 



hydrochloric acid, deep violet ; on boiling, intense red. 

 Friihdes solution, yellow becoming cherry red (24 hours). 



(i) JERVINE A. (Simon and Will's, and Wright and Luff's Jervine), 

 Co6H,,N(),-fiH,0, \V. and L. (C3„H,oN,0;,+-2H,0, Will; or, C.^Ho.XO,, 

 Pehkscheii). Crystallizes in needles from alcohol; slightly Isevo-rotatory, 

 M.P. -'.'u -23',l (l'J0'-201°?) ; non-sternutatory ; sulphate very difficultly 

 soluble. 



Solubility (Pehkschen's figures, at temperature of 22°C), 1 in IG'8 

 alcohol, lio chloroform, 268 ether, 1,G25 benzene ; slightly in water and 

 ethyl acetate ; not in petroleum ether. 



Removed from arid solutions by chloroform. 



Colour tests : 



Concentrated sulphuric acid, yellow becoming successively dark 



yellow, brownish-yellow, then greenish-brown. 

 Concentrated sulphuric acid with sugar, blue. 



,, „ ,, with nitric acid, yellow then green. 



„ nitric acid alone, no effect. 



„ hydrochloric acid, no effect cold ; yellow on warming. 



(c) SABADILLINE A. of Weigelin (Cevadilline of Wright and Luff ; but 

 identity not thoroughly established), CoijHonX.jOj ( W. and L.'a Cevadilline, 

 C34H5:,NOi)) : crystals from benzene (varnish, W. and L.) ; sharp taste ; 

 strongly alkaline reaction (Couerbe) ; non-sternutatory (Hubschmann) ; 

 M.P. 2O0" (Couerbe). 



Soluble in water (143 parts boiling), in alcohol, amyl alcohol, benzene : 

 with difficulty in petroleum ether, and not in ether. 



Removed by amyl alcohol and benzene from both acid and alkaline 

 aqueous solutions ; petroleum ether abstracts traces from an alkaline 

 solution. 

 Reactions : 



[No pp. alkaline hydrates. 

 „ „ carbonates. 



„ ammonia. 

 „ ,, carbonate. 



,, picric acid, 1 in 150. 

 ,, ferric chloride. 

 ,, platinum chloride, 1 in 150. 

 „ gold chloride dilute. 

 ,, potassium sulphocyanide, 1 in 150. 

 „ „ ferricyanide, 1 in 150. 



,, „ bichromate, 1 in 150.] 



Phosjjho-molybdic acid, pp. ; cloud at 1 in 5,000. 

 [No pp. potassic iodide.] 

 lodo-potassic iodide, kermes coloured pp. 



Mercurio-potassic iodide, yellowish- white pp. ; cloud at 1 in 5,000. 

 [No pp. mercuric chloride, 1 in 150.] 

 [No coloration chlorine water.] 

 Bromine water, cloud at 1 in 5,000. 

 [No pp. sodium phosphate.] 

 Colour tests : 



Concentrated sul])huric acid, red. 



„ „ ., with sugar, brown, changing to reddish- 



violet. 

 Concentrated sulphuric acid with nitric acid, gradually cherry-red. 

 ,, nitric acid, yellow. 



,, hydrochloric acid, wine-red. 



Frcihde's solution, gradual reddish-violet. 



(<1) SABADINE A., Co.iH^NOs (Merck) ; crystals like zinc sulphate in 



