96  Linimentum  Terebinthina  Aceticum.  ^Ve^is^""' 
LINIMENTUM  TEREBINTHINiE  ACETICUM. 
By  W.  Symons,  F.C.S. 
In  a  short  paper  read  at  the  Bristol  meeting  of  the  Pharmaceutical 
Conference  in  1875, 1  I  suggested  an  improved  method  of  preparing  the 
above  liniment,  which  attracted  more  attention  than  J  anticipated.  The 
object  of  the  paper  was  not  so  much  to  give  an  exact  formula  in  the 
place  of  that  in  the  Pharmacopoeia  as  to  point  out  a  way  in  which  a. 
perfectly  clear  and  stable  liniment  may  be  prepared,  instead  of  the  very 
unsatisfactory  one  in  the  Pharmacopoeia. 
Having  been  desired  to  suggest  a  formula  as  near  the  Pharmacopoeia 
liniment  as  possible  for  dispensing,  my  attention  has  again  been  called 
to  the  subject.    The  first  proposed  formula  in  my  paper  was— 
No.  1. 
Glacial  Acetic  Acid,  .  .  .  .1  part. 
Spirit  of  Camphor,         .  .  ,  .  2  parts.. 
Castor  Oil,  .  .  .  .  .1  part. 
Turpentine,    .....  2  parts. 
Mixed  in  the  above  order. 
The  second  was — 
No.  2. 
Liniment  of  Camphor,  .  .  .  .2  parts. 
Castor  Oil,      .  ,  .  .  2  " 
Turpentine,  .  .  .  .  2  " 
Glacial  Acetic  Acid,     .  .  .  .  1  part. 
The  castor  oil,  however,  in  this  formula  is  unnecessary,  and  a  clear 
and  stable  liniment  may  be  made  as  follows  : 
No.  3. 
Turpentine,  .  ;  .  .  .3  paits. 
Liniment  of  Camphor,  .  .  .  3  " 
Glacial  Acetic  Acid,  .  ,  .    1  part. 
This  may  be  said  to  be  identical  with  the  Pharmacopoeia  liniment, 
minus  2  parts  of  water,  for  as,  according  to  the  Pharmacopoeia,  glacial 
acetic  acid  contains  84  per  cent,  of  anhydrous  acetic  acid,  while  the 
B.  P.  acetic  acid  contains  28  per  cent.,  it  is  assumed  to  be  near  enough 
to  the  truth  for  the  purpose  of  this  paper  to  speak  of  B.  P.  acetic  acid 
as  containing  one  part  glacial  acid  and  2  parts  water.  The  Pharmaco- 
poeia liniment  will  thus  contain  1  part  in  9  of  glacial  acid,  while  No.  3 
will  contain  1  part  in  7,  although  the  proportion  of  glacial  acid  to  the 
turpentine  and  camphor  will  be  identical  in  each. 
Should  it  be  thought  desirable  to  have  in  the  liniment  exactly  the 
1  See  "  Amer.  Jour.  Phar.,11  1875,  P-  54°-  The  "  turpentine  "  in  the  formulas  is. 
intended  for  "  oil  of  turpentine. " — Ed.  A.  J.  Ph. 
