Am.  Jour.  Pharm. 
July,  1895. 
White  and  Black  Mustard  Seed. 
343 
powder  out  and  allow  the  benzene  to  evaporate.  Re-powder,  and 
place  in  about  four  times  its  weight  of  boiling  alcohol.  Boil  for 
thirty  minutes,  adding  sufficient  alcohol  to  make  up  for  loss  by- 
evaporation.  Filter,  keeping  filter  hot  in  steam-bath.  Set  the 
filtrate  aside  in  a  cold  place  for  about  twenty-four  hours.  The 
sinalbin  separates  out  in  a  crystalline  mass.  Decant  and  preserve 
the  liquid.  Re-dissolve  the  residue  in  hot  alcohol.  Filter  while 
hot  and  set  aside  to  re-crystallize.  Repeat  the  crystallization  until 
pure,  clear  crystals  of  sinalbin  are  obtained.  It  crystallizes  very 
similar  to  sinigrin  in  small,  pearly  needles,  concentrically  arranged. 
Sinapin  Sulphate.    From  an  Alcoholic  Solution. 
When  pure  it  is  almost  colorless,  but  shows  just  the  faintest 
shade  of  yellow.  It  is  sparingly  soluble  in  cold  alcohol ;  it 
requires  3-3  parts  of  boiling  85  per  cent,  alcohol  to  completely  dis- 
solve it.  It  is  easily  soluble  in  water,  and  insoluble  in  ether  and  carbon 
disulphide  ;  its  solutions  are  neutral.  When  heated,  it  melts,  form- 
ing a  yellow  liquid,  and,  when  heated  still  further,  is  decomposed, 
evolving  fumes  of  disagreeable  odor,  and,  like  sinalbin  itself,  alkalies 
turn  it  intensely  yellow,  and  nitric  acid  gives  with  it  a  blood-red 
color. 
In  the  liquid  preserved  from  above  is  contained  sinapine-sulpho- 
cyanate.  It  separates  out,  on  standing  eight  or  ten  days,  in  globular 
aggregations.     The  liquid  may  be  poured  off  and  the  sinalbin 
