"^0 CRUCIFERiE. 



My 



~^..^^, ^^ ^.^ruud^^u vviuii wauKi una iviyrosin, ine latter oi wnicri is a, ^;uu- 



stituent of white mustard as well as of brown (p. 66). The Hquid 

 becomes turbid, the first of the above-named substances separates 

 (together with coagulated albumin) as an oily liquid, not soluble in 

 water, but dissolving in alcohol or ether. This 8ulphocyanate of 

 Acnnyl is the rubefacient and vesicating principle of white mustard. 

 It does not pre-exist, as shown by Will, in the seed, and cannot be 

 obtained by distillation. By treating it with a salt of silver, Will 

 obtained _ crystals of cyanide of acrinyl, C'H'NO : by warming it (or 

 smalbm itself, or an alcoholic extract of the seed) with caustic potash, 

 suiphocyanide of potassium is produced. The presence of the latter 

 may be indicated by adding a drop of perchloride of iron, when a blood- 

 red coloration will be produced,' 



Sulphate of 8 inapine imparts to the emulsion of white mustard, in 

 wnicn it IS formed, an acid reaction. Sinapiue is itself an alkaloid, 

 Which has not yet been isolated, as it is very liable to change. Thus its 



l^lT T • ' v^"" ""^ ^ ^'^^"^ of alkali immediately assumes a bright 

 yellow colour indicating decomposition, and a similar colour is produced 

 m an aqueous extract of the seed. 



«nrl i+.% •''^•^^^''°'^''^' ^^o^' ^^at the chemical properties of sinalbin 

 mustard '^^^^^^ maKe their appearance m an emulsion oi biativ 



as tW on!l'' '°^'^i!;^^^ts of white mustard seed are nearly the same 

 mentSned^''^^.^^ ^^* ''^ ^PP^^^ ^^ ^i^ld i^ '-addition to the acids 

 T^uuli ^^Pi^^^^^^^c or menic Acid, C^H-O^ White mustard 



pretw articlf tK ^^^"^ ^^^'^ ^° myrosin, so that, as explained in the 

 ZlAA-.^l^'^'b the pungency of the latter mav be often increased by 



100 



or 



an addition of wint. mn.f... ^y burning "white mustard dried at 

 nitrocren ir,<^^^'7~T'\ '"^ o^'^ained from 4: 20 to 4-30 per cent ot 

 fixed^oU'ome 2 ' ^^'f ^^ P^^ ^^^t- <=>f protein substances.^ Thj 

 by the epide?mkV The mucilage as yielded 



ferric chlorideTd ?. P^^.T^t^^l^ by alcohol, neutral lead acetate, - 



Erticintl'd^' ^^''}^^ ^° ^^^ter after dryin- 

 consttSs 0^^^^^^^^^^ mentioned by Simon (1838)^ as peculiar 



further investLlt on rt^'^' ''' altogether doubtful, yet may deserv 

 (1852) is rpXt of tb ^ ''"'P^' ^''^ ^^ ^^^ S^bo ^°d Hirschbrunn* 



Uses^mt J '^' f-omposition of sinapine. 



White M 



paste with cold ^vaioT.Z "^ reduced to powder and made 



skin, notwithstanding tiif'r"^^^^ ''^^-]^^' ^^^^^ ^M^'^ 



tU t.^" 



.sential 



also Brown Mustard se'ed.'' ^''^P^''^^ ^^^ the table and which contain 



' Ibid. 521. 



