ON  THE  PREPARATION  OF  FLUID  EXTRACTS. 
151 
third  portion  was  allowed  to  macerate  for  four  days  ;  the  condi- 
tions of  all  being  made  as  nearly  alike  as  possible,  in  regard  to 
temperature,  packing,  pouring  on  the  menstruum,  &c.  The  dis- 
placed tincture  was  carefully  collected  in  portions  of  one  fluid- 
ounce  each ;  each  ounce  was  then  evaporated  separately,  and 
the  weight  of  solid  extract  furnished  by  each  ounce  carefully 
noted.    The  following  results  were  obtained  : 
Percolate  No.  1. 
The  1st  oz.  yielded  of  solid  extract, 
94 
grs. 
"   2d    "     "       "     ^'  " 
OA 
u    g(j     a       u        a      u  a 
60 
u 
a    4th           "        "  " 
45 
The  first  pint  after  this  yielded  of  solid  extract, 
XT                                           J  J 
102 
u 
"   2d  and  3d  pints          "          "  " 
78 
And  3  pints  additional       "  " 
40 
a 
499 
T^P'ynnl nfp  ATT) 
JL   Ol  t/ft/ttl/C'    Xi  C  ^« 
The  1st  oz.  yielded  of  solid  extract. 
loo 
grs. 
a  2d 
90 
ii 
u    g(j     a       u        u      u  u 
65 
a 
a    ^^Y^    u       a        u      a  u 
45 
Pint  after  this  yielded  of  solid  extract, 
115 
a 
500 
Percolate  JVo.  S. 
The  1st  oz.  yielded  of  solid  extract. 
200 
grs. 
n    2d  ^' 
143 
a 
u             u       a        a      u  n 
90 
ii 
u    ^^Yi  "  " 
30 
u 
And  8  oz.  after  this,  to  exhaust,  yielded 
48 
a 
511 
Upon  examination  and  comparison  of  these  results,  it  is  found 
that  the  total  yield  of  extract  is  almost  identical  in  the  three 
experiments.  Four  ounces  of  bark  having  yielded  in  one  case 
499  grains,  in  another  500,  and  in  the  third  511  grains  of  solid 
extract,  being  about  26  per  cent. 
