GLYCERIN  TO  PREVENT  THE  DEPOSITION  OF  APOTHEME.  327 
fluidounces,  mix  with  the  reserved  portion,  and  strain,  if  neces- 
sary, through  a  muslin  strainer. 
The  resulting  extract,  of  which  a  specimen  is  herewith  sub- 
mitted, is  of  a  deep  reddish-brown  color,  entirely  clear  and 
transparent,  in  thin  layers,  and  having  in  perfection  the  flavor 
of  the  root. 
It  is  much  thinner  than  the  officinal  extract,  and,  as  is  be- 
lieved, will  be  found  to  be  a  more  satisfactory  preparation.  A 
precipitate  is  formed  by  the  addition  of  water ;  the  extract  is, 
however^  soluble  in  all  proportions  in  syrup,  so  that  an  elegant 
syrup  may  be  prepared  from  it  extemporaneously  by  the  simple 
addition  of  syrup,  and  the  syrup  thus  made  of  the  officinal 
strength  is  miscible  with  water  without  precipitation.  A  sample 
is  herewith  presented. 
,  Decoction  of  Yellow  Cinchona. — For  the  purpose  of  compari- 
son, two  decoctions  were  prepared,  one  according  to  the  U.  S. 
Pharmacopoeia,  the  other  in  the  same  manner,  excepting  the  ad- 
dition of  a  fluidounce  of  Glycerin  in  making  a  pint.  The  two 
decoctions  were  very  similar  in  appearance ;  that  containing  the 
Glycerin  having  a  rather  darker  color.  No  difference  in  the 
strength  of  the  two  could  be  discovered  by  the  taste,  the  bitter- 
ness of  one  being  somewhat  disguised  by  the  Glycerin.  After 
standing  for  two  days,  both  of  the  decoctions  remained  equally 
turbid ;  an  ounce  of  the  one  containing  Glycerin  remained 
slightly  turbid  after  the  addition  of  two  fluidrachms  of  Glycerin, 
but  become  perfectly  clear  upon  the  addition  of  a  third  fluidrachm. 
The  conclusion  arrived  at  from  these  experiments  was,  that 
the  addition  of  Glycerin  to  the  decoction  would  not  be  advisable, 
for  although  a  greater  amount  of  extractive  matter  might  be 
obtained  from  a  given  amount  of  the  bark,  still  the  same  end 
(that  is,  increased  strength)  might  be  arrived  at  more  simply  and 
economically  by  using  a  larger  quantity  of  the  cinchona  bark. 
Infusion  of  Yellow  Cinchona. — Two  cold  infusions,  of  half  a 
pint  each,  were  prepared,  one  with  water,  the  other  with  water 
to  which  half  an  ounce  of  Glycerin  had  been  added.  (The  aro- 
matic sulphuric  acid  being  left  out  in  both  cases.)  The  results 
and  conclusions  arrived  at  were  substantially  the  same  as  in  the 
preceding  experiment  with  the  decoctions. 
