236 
MYRONATE  OF  POTASH  FROM  BLACK  MUSTARD. 
of  chromium,  when  reduced  to  fine  powder  is  one  of  the  best 
reducing  and  polishing  substances  for  metals  known,  and  which 
we  think  is  even  superior  to  the  finest  emery  for  polishing  steel. 
The  best  iridium  pointed  gold  pens  become  useless  when  used 
for  writing  signatures  for  a  few  hours  over  the  green  chrome  ink 
that  is  printed  on  bank  bills. — American  Druggists'  Circular 
from  Mining  Chro7iicIe, 
GLYCERINE  POMADE   OF  IODIDE  OF  POTASSIUM. 
By  M.  Thirault. 
This  formula  is  published  by  the  French  Societe  emulation 
des  pharmaciens  de  V  est.    It  is  as  follows  : 
Glycerine  (sp.  gr.  25  to  30j  grammes  1000. 
Sapon.  animal,  pulv.  50. 
Potass,  iodid.  palv.  "  130. 
Dissolve  in  a  water-bath,  pour  immediately  into  a  warm  marble 
mortar,  and  triturate  briskly  for  a  quarter  of  an  hour.  It  is 
then  aromatized  with  two  grammes  of  essence  of  bitter  al- 
monds. 
This  pomade  can  be  preserved  for  a  very  long  time  without 
alteration,  and  should  be  ranked  among  ofiicinal  medicines.  As 
the  iodine  salt  is  present  in  a  state  of  perfect  solution,  we  can 
readily  understand  that  it  would  be  rapidly  absorbed.  There 
is  no  repugnance  to  its  employment  with  any  one,  since  it  can 
be  made  to  resemble  in  its  appearance,  consistence  and  odor,  an 
agreeable  cosmetic.  It  neither  colors  the  skin  nor  the  linen. 
These  are  all  valuable  qualities  entitling  it  to  a  place  in  the 
therapeutic  arsenal. — Repertoire  de  Pharm. — Journ.  and  Trans, 
of  the  Maryland  College  of  Pharm.  L.  H.  S. 
ON  THE  MYRONATE  OF  POTASH  FROM  BLACK  MUSTARD. 
Bf  MM.  H.  LuDwiG  AND  W.  G.  Lange. 
We  know,  from  the  researches  of  M,  Bussy,  that  black  mus- 
tard does  not  contain  the  essential  oil  ready  formed,  but  that  it  . 
is  produced,  in  the  presence  of  water,  by  the  action  of  the  my- 
rosine  on  a  particular  salt — the  myronate  of  potash.    The  re- 
