f 
62  Process  for  Preparing  Emulsions,  etc.  {^eHim?*' 
First.  Pour  the  turpentine  into  a  two-ounce  vial,  and  shaking  so 
as  to  coat  the  inside  of  the  vial  with  a  film  of  turpentine  ;  this  is  to 
prevent  the  action  of  the  moisture  usually  present. 
Secondly.  I  add  9j  powdered  acacia,  and  mix  thoroughly  with 
the  oil. 
Lastly.  Half  a  fluid-ounce  of  water  is  added,  and  the  whole  is  well 
shaken.  A  perfect  emulsion  is  the  result,  requiring  less  time  for  its 
preparation  than  to  read  the  foregoing  directions.  The  bottle  may 
then  be  filled  up  with  mucilage,  or,  according  to  my  experience,  a 
better  product  is  obtained  with  water  simply. 
The  deviation  from  the  letter  of  the  law  in  regard  to  the  gum 
strength  of  the  emulsion  needs  no  apology  to  the  practical  phar- 
macist, as  the  sole  object  in  view  is  to  emulse  the  oil,  and  it  will  be 
found  that  ten  grains  to  the  fluid-ounce  of  emulsion  will  afford  a 
product  superior  in  all  respects  (especially  in  fluidity)  to  one  contain-, 
ing  more  gum,  and  more  nearly  approaching  the  peculiar  characteris- 
tics of  that  most  perfect  of  all  emulsions — cow's  milk. 
An  emulsion  of  turpentine  prepared  in  this  manner  and  allowed  to 
stand  some  time,  shows  not  the  least  separation  of  its  oil,  but  floating 
on  the  surface  of  the  water  is  a  stratum  of  a  true  "  cream,"  which, 
like  its  prototype,  requires  but  slight  agitation  to  mix  thoroughly 
with  its  substratum. 
I  have  for  some  time  past  kept  an  emulsion  of  oil  of  turpentine  pre- 
pared as  above,  containing  half  its  volume  of  oil,  for  use  in  dispensing, 
and  as  the  oil  is  perfectly  emulsed,  its  incorporation  in  any  desired 
amount  of  mixture  or  vehicle  requires  no  more  labor  or  skill  than  in 
the  case  of  a  tincture  or  syrup.  I  find,  also,  that  the  emulsion  rather 
improves  by  standing,  the  "  cream  "  becoming  more  homogeneous. 
It  is  often  desirable  to  administer  this  oil  in  quite  large  doses,  and 
it  will  be  found  that  a  mixture  of  one  part  of  an  emulsion  of  the  above 
strength,  with  three  parts  of  syr.  wild  cherry  will  give  a  preparation 
that  is  rather  pleasant  than  otherwise,  both  as  regards  taste  and  odor. 
Actual  experiment  has  demonstrated  that  this  method  is  applicable 
to  all  liquids  that  possess  no  solvent  power  as  regards  gum  acacia, 
and  that  possess  a  reasonable  degree  of  mobility.  In  accordance 
with  this  fact  it  will  be  found  that  ether  and  chloroform,  when  treated 
in  this  manner,  will  yield  perfect  emulsions,  and,  as  the  operation  is 
conducted  in  a  close  vessel,  the  loss  sustained  in  the  usual  process  is 
not  incurred. 
