231 



smoky flame. The O. yields on trituration an electric powder, is 

 of neutral reaction, is insoluble in cold water, whereas boiling- 

 water dissolves only traces, little soluble in benzol and petroleum- 

 ether, easily in alcohol and ether. The alcoholic solution exhibits, 

 especially after addition of a little water, a blue fluorescence. It 

 dissolves also in caustic potash, soda and ammonia, and is there- 

 from reprecipitated by carbonic acid. It is not precipitable by 

 metallic salts, and forms with hydrochloric acid gas in alcoholic 

 solution crystals of hydrochloride of Ostruthin.] 



[Ox.Vllsircotill=:C22 H23 NOs. Alkaloid prepared by Beckelt 

 and Wright, from the mother-liquor remaining in the preparation 

 and purification of narcein from opium. It forms small, mica-like, 

 sandy crystals, little soluble in water and alcohol, even on boiling, 

 similar in appearance to narcotin, but difiiering from it by its 

 s})aring solubility in hot water and alcohol, and its insolubility in 

 l:)enzol, ether and chloroform. Fixed alkalies and then- carbonates 

 precipitate the 0. from its concentrated solutions, not or only 

 partially after some time from diluted ones. Analogous to the 

 hydrochlorides of narcotin and narcein, the hydrochloride of O. by 

 hot water breaks up into fi'ee acid and a basic salt.] 



[PicrorOfCellill, Nitrogenised, neutral substance, found by 

 tStenhouse and Groves, in Koccella fuciformis. — It crystallises in 

 long, colourless prisms, of considerable lustre, and of very bitter 

 taste, insoluble in water, petrolexim and sulphide of carbon, little 

 soluble in ether and benzol, moderately soluble in boiling alcohol. 

 It fuses at 192° to 194°, and decomposes afterwards. Dissolves iai 

 concentrated sulphuric acid, with yellow coloiir on warming, re- 

 precipitable as yellow powder on addition of water. The same 

 takes place with nitric acid. On heating P. for ten minutes at 

 220°, or on boiling with dilute sulphuric or hydrochloric acid, it is 

 converted into Xanthoroccellin, a nitrogenised body, crystallising in 

 long, slender, yellow needles.] 



['riievetosin. Poisonous glucosid, discovered by Herrera in 

 the seeds of Thevetia yccotli. — White, quadrangular prisms, in- 

 odorous, of intensely acrid taste, not soluble in water, very little 

 soluble in ether, sulphide of carbon, fixed and volatile oils, easily 

 soluble in alcohol. Yields, with dilute sulphiiric acid, sugar and a 

 resin. The alcoholic solution is not changed by nitrate of silver, 

 the chlorides of platinum, gold and iron, iodide and iodate of 

 ])otassium, tannic acid, the hydrates and carbonates of alkalies, 

 ferro- and ferricyanide of potassium.] 



