^""octriSs^'™  }    '    Petrolatum  in  the  Officinal  Ointments.  49^ 
of  potassium,  one  part;  water,  two  parts;  petrolatum,  ninety-three 
parts  ;  use  the  officinal  process.  A  dark  greenish  black  ointment  is 
produced,  which  is  probably  not  inferior  to  the  officinal.  The  advan- 
tages of  the  use  of  petrolatum  here  are  not  so  apparent  as  in  some  of 
the  other  ointments. 
Unguentum  Iodoformi. — Iodoform  Ointment. — Iodoform,  in  very 
fine  powder,  ten  parts ;  petrolatum,  ninety  parts.  Rub  the  iodoform 
with  the  petrolatum,  gradually  added  until  they  are  thoroughly  mixed. 
Preferable  on  therapeutic  grounds. 
Unguentum  Mezerei. — Mezereum  Ointment. — Fluid  extract  of 
mezereum,  twenty-five  parts ;  petrolatum,  eighty  parts ;  yellow  wax^ 
twelve  parts.  Melt  together  the  petrolatum  and  wax  with  a  moderate 
heat,  add  the  fluid  extract,  and  stir  the  mixture  constantly  until  the 
alcohol  has  evaporated,  then  continue  to  stir  until  cool.  The  advan- 
tages of  petrolatum  in  this  ointment  over  lard  are  not  very  apparent,, 
as  it  is  used  as  a  stimulating  application. 
Unguentum  Picis  Liquids. — Tar  Ointment. — The  use  of  petrol- 
atum here  is  not  recommended,  although,  if  desirable,  a  mixture  of 
yellow  wax  and  petrolatum  of  the  consistence  of  suet  could  be  used. 
Unguentum  Plumbi  Carbonatis. — Ointment  of  Carbonate  of 
Lead. — Carbonate  of  lead,  in  very  fine  powder,  ten  parts ;  petrolatum, 
ninety  parts.    Rub  the  carbonate  of  lead  with  the  petrolatum,  gradu- 
ally added  until  they  are  thoroughly  mixed.    Preferable  therapeuti- 
cally to  the  officinal. 
Unguentum  Plumbi  Iodidi. — Ointment  of  Iodide  of  Lead. — 
Iodide  of  lead,  in  very  fine  powder,  ten  parts ;  petrolatum,  ninety  parts. 
Rub  the  iodide  of  lead  with  the  petrolatum  gradually  added  until  they 
are  thjroughly  mixed.  A  bright  orange-colored  ointment,  which 
darkens  on  the  surface  when  exposed. 
Unguentum  Potassii  Iodidi. — Ointment  of  Iodide  of  Potassium. — 
Iodide  of  potassium,  in  fine  powder,  twelve  parts ;  hyposulphite  of 
sodium,  one  part ;  boiling  water,  six  parts ;  petrolatum,  eighty-one 
parts.  Dissolve  the  iodide  of  potassium  and  the  hyposulphite  of  sodium 
in  the  boiling  water  in  a  warm  mortar  ;  then  gradually  add  the  petro- 
latum and  mix  thoroughly.  This  ointment  is  of  a  lemon  yellow  color, 
but  shows  a  disposition  to  separate  on  keeping  due  to  the  presence  of 
the  water;  it  should  only  be  made  as  it  is  needed. 
Unguentum  Stramonii. — Stramonium  Ointment. — Extract  of  Stra- 
monium, ten  parts ;  water,  five  parts  ;  petrolatum,  eighty-five  parts. 
