126 3 - CRUCIFER A. 
_ principle, saientisi oil of mustard is obtained, amounting , 
“to +2 or ‘7 per cent., and under certain conditions ‘more fro 
B. nigra. This ot which has the composition CS N C* i 
allyl thiocarbimide, boils at 150°-7 C., has a specific gravi 
at 0° of 1-036, no rotatory power, and is soluble without col 
ration or —— in three times its weight of cold str 
lizable substance, then termed M yronate of Potassium 
C'° H'8 KNS? 0!°, but now known. as Sinnigrin, frot 
its analogy to sinalbin. _ Sinnigrin when brought into con 
sulphate, and glucose. At the same time a part of the 
is converted into stlphur and crotonitril. ( Roscoe.) » My 
is an albumenoid principle contained in white mustard. 
aqueous solution coagulates at 60° ©., and then be 
. Inactive : hence mustard seed which has been roasted - 
mustard seed ; it is easily soluble in water, less so in alco! 
aad Seybtalieal: in small pearly needles. By the action 
-myrosin it is converted into ‘sinalbin-mustard-oil; and sulph 
_ of sinapine and glucose. For further information the reader 
referred to Roscoe and ‘Schorlemmer’s work on Orga 
Chemistry. 
fs 
Pate a 
The seeds, roots and herbaceous parts of many of 
 Crucifers, yield a volatile oil cémposed in part of mustard 
and in part of allyl sulphide, Cé H'°S, which is also 
able from garlic. Many Cruciferze afford from their : 
seeds chiefly or solely oil of Tooter and — ‘ 
of garlic, 
