AmAJp0riijf91iarm'}  Benzoin  and  Preparations  of  Benzoin.  187 
heated  on  a  water-bath  for  about  an  hour  and  strained  as  before.  A 
third  method  consists  in  thoroughly  mixing  15  parts  of  lard  with  I 
part  of  benzoinated  oil,  which  is  prepared  as  follows  : 
Macerate  benzoin  in  coarse  powder,  1  oz.,  with  ether  3  fl.  oz.,  until 
dissolved,  filter,  add  3  fl.  oz.  of  castor  oil,  shake  well,  remove  the 
ether  by  evaporation  or  distillation,  and  add  sufficient  castor  oil  to 
make  it  measure  4  fl.  oz. 
Syrupus  benzoini. — Rub  tincture  of  benzoin  1  fl.  oz.,  with  magne- 
sium carbonate  120  gr.,  and  sugar  1  oz.,  then  triturate  with  8  fl.  oz. 
of  water,  filter,  add  12  troyounces  of  sugar,  and  dissolve  with  the 
aid  of  a  gentle  heat.  When  first  made  the  syrup  is  cf  a  somewhat 
lighter  color  than  syrup  of  tolu  ;  but  upon  straining  it  becomes  of  a 
golden  yellow,  slightly  tinged  with  green.  Its  flavor  is  agreeable 
vanilla-like  and  preferable  to  that  of  tolu.  It  may  be  prepared 
extemporaneously  from  : 
Soluble  tincture  of  benzoin,  which  is  obtained  as  follows  :  Mix  3 
fl.  oz.  of  alcohol  with  8  oz.  of  glycerin;  dissolve  in  this  liquid  upon 
a  water-bath,  \  y2  oz.  of  benzoin  ;  add  6  fl.  oz.  of  water  and  set  aside 
until  cold;  decant  from  the  precipitated  resin  the  milky  liquid;  tritu- 
rate this  with  120  gr.  of  magnesium  carbonate,  filter,  and  pass 
through  the  filter  sufficient  of  a  mixture  of  one  volume  of  alcohol 
and  two  of  water  to  make  the  whole  filtrate  measure  16  fluidounces. 
It  forms  a  yellow  or  light  brown  liquid  of  an  agreeable  odor ;  and 
by  mixing  one  measure  of  it  with  three  measures  of  simple  syrup, 
will  yield  a  pleasantly  flavored  syrup  which,  however,  is  not  equal 
in  color  or  in  balsamic  properties,  to  the  syrup  prepared  by  the  pre- 
ceding formula. 
Syrupus  benzoini  compositus  has  been  prepared  from  the  pharma- 
copceial  compound  tincture  of  benzoin  by  Harry  H.  Swainbank, 
Ph.G.,  and  has  been  prescribed  by  several  physicians  who  found  it 
quite  beneficial,  particularly  in  combination  with  stronger  expector- 
ants, like  ammonium  chloride,  etc.,  with  which  a  very  agreeable  and 
efficacious  cough  syrup  may  be  prepared.  The  syrup  is  best  made 
from  the  tincture  with  the  aid  of  magnesium  carbonate,  by  mixing 
30  gr.  of  the  latter  with  2  fl.  drachms  of  the  tincture,  adding  2  fl. 
oz.  of  water,  filtering,  washing  the  filter  with  sufficient  water  to 
make  the  filtrate  measure  2  fl.  oz.,  and  dissolving  in  this  3  troy- 
ounces of  sugar.  Thus  prepared  the  syrup  is  clear,  of  a  dark  amber 
color,  and  has  a  pleasantly  bitter  and  aromatic  taste. 
1 
