286 
Emulsiones  Oleosa. 
Am  Jour.  Pharm. 
June,  1878, 
well  for  a  few  minutes,  when  a  good  emulsion  was  formed,  and  then 
added  sufficient  water  to  make  f$v.  This  emulsion  remains  unchanged 
after  keeping  it  six  weeks  at  a  constant  temperature  of  jo°F. 
2.  I  then  reduced  the  quantity  of  water  one-fourth,  mixing  at  once 
ol.  morrhuae,  f^iv  ;  powd.  gum  arabic,  3ii ;  aqu.  dest.,  f^iii,  and  then 
diluted  with  the  balance  of  water  ;  the  result  was  the  same.  This  is 
the  favorite  method  of  most  German  apothecaries,  and  is  considered  by 
them  better  and  surer  to  bring  success  than  the  first.  •  I  have  made 
very  many  emulsions  by  it  with  various  oils  during  a  number  of  years, 
and  never  failed.  There  are  now  on  hand  four  emulsions  containing 
50  per  cent,  of  codliver  oil,  castor  oil,  turpentine  and  copaiva,  respec- 
tively, made  by  the  second  method  about  four  weeks  ago.  So  far  they 
are  still,  as  in  the  beginning,  elegant  in  appearance,  and  show  no  incli- 
nation of  spoiling  or  separating,  although  kept  at  a  constant  tempera- 
ture of  70°F.  Emulsions  containing  50  per  cent,  of  oil,  made  by  the 
first  method  about  two  weeks  ago,  likewise  appear  unchanged  so  far. 
3.  A  large  proportion  of  gum  is  not  objectionable  in  most  emulsions, 
as  f.  i.  copaiva  emulsions,  preventing  the  latter  from  having  a  too 
strong  purgative  effect  j  in  others,  however  [f.  i.  castor  oil  emulsion), 
care  must  be  taken,  as  a  large  proportion  of  gum  would  counteract  the 
effect  of  the  oil  to  a  certain  extent.  I  therefore  reduced  the  quantity  of 
gum  arabic  to  one-half  of  its  former  quantity,  thus  makingthe  proportions 
oil  4  parts,  gum  arabic  1  part,  water  3  parts.  Emulsions  of  codliver 
oil,  castor  oil,  copaiva  and  oil  of  turpentine,  made  in  this  proportion,  at 
first  presented  as  elegant  an  appearance  as  those  containing  double  the 
quantity  of  gum,  and  remained  unchanged  for  three  days,  then  the 
emulsion  of  copaiva  began  to  separate  into  two  layers,  the  lower  one 
being  only  about  one-fifth  of  the  whole  mixture  ;  on  being  shaken  they 
readily  .reunited,  again  forming,  apparently,  a  perfect  emulsion,  which, 
however,  began  to  separate  again  in  the  course  of  24  hours.  The 
emulsion  of  codliver  oil  oegan  to  separate  a  little  at  the  end  of  four 
days,  that  of  castor  oil  after  six  weeks,  while  the  turpentine  emulsion  is 
still  unchanged. 
4.  An  attempt  to  reduce  the  amount  of  gum  to  one-fourth  the  origi- 
nal quantity,  so  as  to  bring  the  proportions — oil  8  parts,  water  6  parts 
and  powd.  gum  arabic  1  part,  proved  successful  with  codliver  oil,  tur- 
pentine and  castor  oil,  but  gave  an  unsatisfactory  result  with  copaiva, 
even  after  considerable  constant  trituration.    The  emulsions  of  cod- 
