)ICTIllNAUV OK THE ACTIVE I'UI.NCI I'I.ES 01' I'l.ANTS. 



Platinum chloride, nearly white : not 1 in "idO. Sol. in hydrochloric 



acid. 

 Gold chloride, dirty yellow ; dislinct at 1 in ;"i,UOO. 

 Potassium ferrocyanide ; the pp, is PajHj Fey. 

 ,, ferricyanide ; slight at 1 in 1, 000. 



„ sulphocyanide ; soluble on warming. 



Silver potassic cyanide, 1 in ;'i,()00 to 4,000 at orce. 

 Potassium chromate ; the pp. contains Papaverine chromate and free 



Papaverine ; or, if warm, free Papaverine only. 

 Potassium bichromate, at 1 in 3,000 gradual : the pp. is Papaverine 



bichromate. 

 [Not phospho-molybdic acid if dilute ; llrk in i-hanii'len'stif. At 1 in 



1,000 a cloud only.] 

 lodo-potassic iodide, up to 1 in 00,000. 

 Bismuth-potassic iodide, orange red ; slight at 1 in 10,000. 

 Cadmium. potassic iodide, distinct at 1 in 1,000. 

 Zinc-potassic iodide, crystalline ; 1 in 10,00il. 

 Mercuric-potasi^ic iodide, white ; distinct at 1 in l,oOil. 

 [Mercuric chloride, slowly ; not 1 in fiOD.] 

 Chlorine water, greenish : ammonia changes to brown. 

 Iodine tincture, crystalline needles. 

 Colour tests : 



Concentrated sulphuric acid, colourless if pure; otherwise momentary 



bluish-violet, then violet. 

 Concentrated sulphuric acid on warming, blue. 



„ ,, „ with nitre, orange becoming yellow. 



Nitre added to the solution in sulphuric acid after ten hours, 



momentary violet, then orange-wdirty yellow. 

 Concentrated sul|ihuric and nitric acids (together), yellow>~orange. 

 „ nitric acid alone, yellow~v.dark orange. 



„ hydrochloric acid, no etfect. 



FriJhde's solution, green^/^blue->/vviolet->/voherry-red. 



(i')a)/'/I/'/lt'f/?/IW//Vf A., C„H,iNO,(Hessc); crystalline prisms; M.P. U2 . 

 Scarcely soluble in alkalies. 



((5) CODEINE A. (Morphine Methyl ether), C.^H.^iNO.,, and with 3H„0. 

 Octahedral crystals if anhydrous, prisms when hydrated ; M.P. (an- 

 hydrous) 10;')" ; alkaline reaction, slightly bitter (salts very bitter) ; Isevo- 

 rotatory. Physiological action somewhat similar to that of Morphine. 



Soluble in 80 parts cold or 17 of boiling water, 7 arayl alcohol, 10 



chloroform, 12 benzene, in carbon bisulphide, and roadil3- in alcohol and 

 ether ; scarcely in petroleum ether. 



Precipitants : 



Alkaline hydrates (slightly soluble in e.xcess). 



[In ammonia. Codeine is about as soluble as in water, see above.] 



[Not alkaline carbonates.] 



[Not lead acetate, but free Codeine gives pp. of PbO, etc.] 



Tannic acid, white. 



Picric acid, yellow ; distinct at 1 in 250. 



[Ferric chloride, no colour ; see sulphuric acid.] 



Platinum chloride, yellow ; not 1 in 250. 



Palladious chloride, yellow ; not 1 in 250. 



Gold chloride, brown ; not 1 in 1,000. 



[Copper salts give a pp. of CuO with free Codeine.] 



Potassium ferrocyanide, white pp. (alcoholic solution) ; slight at I in 



1,000. 

 Potassium ferricyanide (aqueous solution), white crystalline ; not 1 



in 70 (Plugge). 

 Potassium sulphocyanide, pp. gradually becoming ciystalline ; sol. 



on warming. 

 Silver potassic cyanide, crystalline deposit after some hours. 

 Potassium chromate, pp. = 0. chromate. 



,. bichromate, pjj. = C. bichromate ; gradually at 1 in .3,000. 



Phospho-molybdic acid, limit 1 in 50,000. 



„ antimonic acid, at 1 in 1,000, dirty white cloud, 

 lodo-potassic iodide, kermes coloured. 

 Bismuth-potassic iodide, orange ; distinct at 1 in 50,000. 

 Cadmium-potassic iodide, pp. gradually crystalline, 1 in 500. 

 Zinc-potassic iodide, long hair-like crystals, very abundant, so that 



solution when not too dilute becomes almost solid (not at 1 in 



1,000). 

 Mercuric-potassic iodide, abundant pp. at 1 in 5,000 ; limit 1 in 



50,000. 

 Mercuric chloride, not 1 in 500. 



Chlorine water, colourless solution ; ammonia gives reddish-brown. 

 Bromine water, pp. distinct at 1 in 50,000. 



Colour tests : 



Concentrated sulphuric acid, colourless, but deep blue if containing 

 feriic salt. 



