203 



Sinapin SuIphocyaiiitle=C32 H23 NOn + C2 NS2 H. Ob- 

 served in the seeds of Brassica alba, B. nigra and Arabis perfoliata. 

 Free the pulverised seeds completely from the fixed oil by means 

 of ether, exhaust with absolute alcohol (which dissolves a little 

 sinapin), boil the remnant with alcohol of 90%, press, repeat the 

 oiieration twice, and distil the tinctures, when the SLnapin-Sulpho- 

 eyanide will crystallise from the remaining liquid. — It appears in 

 white, very voluminous, pearly, tuftily united needles, is inodorous, 

 has a bitter and mustard-like taste ; is of neutral reaction, fuses at 

 130°, decomposes by more heat, dissolves in water and in alcohol 

 with yellow colour, more readily when warm, the solutions be- 

 coming colourless with even traces of an acid; is insoluble in 

 ether, sulphide of carbon and oil of turpentine, reddens the salts 

 of oxyd of ii'on. [According to Will, Sinapin-sulphocyanide, or more 

 pi'operly called Sinalbin, has the composition Ceo ^u N 2 S 4 O32. 

 When placed into contact with water and myrosin, it breaks up 

 into Sulphocyanate of Acrinyl, Sulphate of Sinapin and sugar.] 



Siliapisill. According to Simon, a fat occurring in the black 

 mustard- seeds, and not saponifiable. Treat the pulverised seeds 

 with alcohol of 94%, evaporate the tincture to honey consistence, 

 treat with ether, evaporate the ethereous liquid to honey consist 

 ence, remove sugar, oil, and resin by washing with small quanti- 

 ties of ether, dissolve the residue in alcohol of 90%, decolourise the 

 solution by means of animal charcoal, filter and evaporate. Re- 

 crystallise the scaly crystalline mass in ether. — Forms snow-white 

 scales, dissolves readily in alcohol, ether and oils, not in acids or 

 in alkalies; may be sublimated. 



SiuigTiii = Myronate of Potassium. 



Sipirill. As to occurrence and preparation see Bebirin. Dark- 

 red-brown, glossy, resinous mass, dissolves very slightly in water, 

 readily in alcohol, not in ether, neuti-alises the acids, forming olive- 

 brown salts. — Is, according to Tilley, impure Bebirin. 



SniilacilirzC42 H34 O14. In the sarsaparilla, in the quina- 

 I'oot, and in other species of the geniis Smilax. Boil with water, 

 precipitate the decoction with hydrochloric acid, wash the deposit 

 and dissolve in diluted sulphuric acid, precipitate with ammonia, 

 and purify, if necessary, by redissolving in alcohol and treating 

 with animal charcoal. Or, draw out with alcohol, precipitate the 

 tincture with watei', wash the deposit with ether, dissolve in 

 alcohol, and decolourise with animal charcoal. — White warty mass 

 or loose powder, permanent at the air, inodorous, of a bitter and 

 acrid, somewhat astringent and naiaseous taste, of neutral reaction, 

 fuses by heat, and decomposes in higher temperatures, dissolves 

 scarcely in cold, more copiously in hot water, yielding a froth by 

 shaking; little soluble in cold, most readily in boiling alcohol, to 



