DKTIO.NAKV <1K THE ACTIVE rUINCU'LES OE TEA NTS 



05 



Ammonia, not at once, at 1 in KKI ; oily pp. becoming crystalline. 

 [Xot lead acetate, neutral or basic] 

 Tannic acid, 1 in l'.OUO ; limit 1 in 10,000. 

 Picric acid, pp. gradually crystalline ; limit 1 in 10,000. 

 Platinum chloride, 1 in 1,000, yellow crys. (insoluble in acetic acid), 

 (jold chloride, 1 in 25,000, dirty yellow, amorphous ; soluble in hydro- 

 chloric acid. 

 Potassium ferrocyanide, yellow crystalline (not 1 in 500, Dupuy), 



becoming blue on exposure. 

 Potassium sulphocyanide (gradually at 1 in 100). 

 Silver potassium cyanide, pp. becoming crystalline. 

 Potassium cliromate, yellow crystalline, limit about 1 in 500. 

 Potassium bichromate ; at first no pp., then crys. up to 1 in 3,000. 

 Chromic acid, 5 per cent. 

 Phospho-mol} baic acid, 1 in 5,000, orange flocks. 



,, antimonic acid, 

 lodo-potassic iodide, 1 in 50,000, kerraes pp. 

 Potassium iodide alone, crystalline pj). 

 Bismuth-potassium iodide, 1 in 10,000, orange-red pp. 

 Cadmium-potassic iodide, crystalline ; precipitation complete. 

 Mercuric-potassic iodide, whitish yellow, amorphous ; feeble at 1 in 



50,000. " 

 Mercuric chloride, amorphous unless concentrated. 

 Chlorine water, yellow coloration becoming red, then colourless, 



finally white flocculent pp. 

 Bromine water, violet color.iiiou. 

 Iodine tincture, brown crystals. 

 Colour tests : 



Concentrated sulphuric acid, pure, colourless. 



„ ,, „ with sugar, no effect. 



,, ,, „ with potass, bichromate, orange ; red 



with dilute acid. 

 Concentrated sulphuric acid, with trace of nitric acid, intense red. 

 Kitre added after 15 hours' solution in sulphuric acid, rose-v«.orange 



•>~yellow. 

 Nitric acid alone, scarlet to blood-red, becoming yellowish-red, then 



yellow ; on then adding stannous chloride or ammonium sulphide, 



reddish-violet. 

 Concentrated hydrochloric acid, no effect. 

 Frohdfc's solution, red-^yellow ; after 24 hours, colourless. 



(r) IGASURINE A. Schiitzenberger and W. A. Shenstone have shown 

 this to be a mixture. Desnoix' description {Jaurn. J'liann. [3], 25, '202) 

 is here given as an illustration of the results one may obtain when dealing 

 with mixed alkaloids from Xux Vomica. 



Silky crystals with 10 per cent, of water, tevo-rotatory, alkaline, 

 bitter. 



Soluble in 20O parts of boiling water, crystals being rapidly formed ou 

 ooolin;; ; also in alcohol, amyl alcohol, and essential oils ; with difficulty 

 in ether. 



Reactions : 



Alkaline hydrates I , ,, • „ „„„„ 



, . ■' ,- pp. soluble in excess. 



Ammonia | ^"^ 



Alk. bicarbonates precipitate in presence of tartaric acid, 'distinction 



from Brucine.' 



Tannic acid, white pp. 



Platinum chloride, yellow pp. 



Potassic iodide, ])p., not immediatel}'. 



lodo-potassic iodide, brown pp. 



Concentrated sulphuric acid with trace of nitric acid I j^fg^gg ^^^ 



„ nitric acid alone ) 



(f/) CURARINE A., Ci„H,.-,N, Preyer (C1SH35N, Sachs) ; crystals from 



chloroform, becoming oily on exposure ; feebly alkaline reaction, bitter, 



extremely poisonous. Salts non-crystallizable and very soluble. 



Soluble in all proportions in water or alcohol, with difficulty in amyl 



alcohol or chloroform. Insoluble in ether, benzene, petroleum ether, 



carbon bisulphide, or turpentine. 



Not removed from alkaline aqueous SDlutions by immiscible solvents. 



Precipitants : 



Tannic acid, pp. soluble in hydrochloric acid. 



Platinum chloride, yello«-, becoming crystalline. 



Potassium ferrocyanide. 



„ sulphocyanide. 



,, bichromate, amorphous. 



Phospho-raolybdic acid. 



Bismuth-potassic iodide. 



Cadmium-potassic iodide, completely. 



Mercuiic-pota.ssic iodide. 



Mercuric chloride. 



Potassium platinous cyanide. 



,, per-iodate. 



