1 2  Fluid  Extract  of  Cimicifuga.         { AmjJa°nuy-I87h8arm- 
ounces  of  powder  by  the  official  process,  repercolation  falls  79*66  grains 
short  of  simple  percolation  ;  this  will  make  sixteen  fluidounces  of  fluid 
extract  by  repercolation,  lack  53*11  grains  of  the  simple  percolation, 
equivalent  to  359*01  grains  of  cimicifuga.  Repercolation  represents 
nearly  9 J  troyounces  of  cimicifuga  ;  percolation  about  10  troyounces, 
being  5  per  cent,  in  favor  of  simple  percolation.  These  experiments 
can  only  compare  repercolation  and  percolation  by  this  (to  me)  unsatis- 
factory process.  The  theory  of  repercolation,  as  T  understand  it  now, 
presents  quite  a  different  aspect.  I  will  introduce  two  similar  experi- 
ments, intended  to  compare  percolation  and  repercolation  ;  both  were 
instituted  at  the  same  time,  both  had  the  same  total  height  of  powder, 
and  to  both  I  gave  all  the  care  possible. 
Repercolation. — 3,840  grains  of  powdered  cimicifuga  were  moistened 
with  2  fluidounces  of  alcohol  and  pressed  into  a  cylindrical  percolator 
three  inches  in  diameter  until  the  powder  occupied  5  inches  in  height. 
It  was  covered  with  a  circular  paper,  held  in  place  with  a  perforated 
piece  of  tin,  and  35  fluidounces  of  alcohol  added.  The  percolate  was 
separated  as  it  passed  into  portions  of  6,  3,  4J  and  9  fluidounces.  The 
first,  6f^,  was  reserved. 
TABLE  6.  Result  of  Experiments  by  Repercolation. 
6 
0  rt  <D 
rv  e 
natl 
«  S  0- 
16  floz.  of  finished  fluid  extract 
Amount  of  powder 
<*« 
0 
*£  v  . 
mou 
tive 
eacl 
operated  upon. 
a  . 
«.  >  u 
S  \2  ° 
« .2  i 
represent  powd'd 
3   O  H 
contain  dry  ex- 
IS 
sis 
0  <u  «  u 
tract. 
Cimicifuga. 
< 
<  *"~ 
H 
8  oz. 
i*57  gr. 
278*08  grs. 
8 
7*5 
1*32 
292  25 
8 
10  5 
1-30 
402-95 
24 
24- 
973  28 
648  85  grs. 
4397  20  grs. 
3,840  grains  of  powdered  cimicifuga  were  moistened  with  the  second 
portion  of  the  percolate  (3^)  from  the  last  powder.  It  was  pressed 
into  a  three  inch  percolator  until  it  occupied  five  inches,  and  was  then 
covered  with  paper  like  the  last,  and  the  two  remaining  fractions  of  the 
percolates  added  in  the  order  they  came.  The  first  (4|f^)  being  per- 
mitted to  disappear  before  it  was  followed  with  the  other.  Alcohol  was 
