236   THE  MOST  CORRECT  METHODS  FOR  PREPARING  EXTRACTS. 
Table  I. 
Embraces  the  results  from  those  plants  which  are  best  ex- 
tracted by  water ;  the  column  marked  A,  contains  the  officinal 
names  of  the  extracts;  B,  the  names  of  the  plants;  C,  the  time 
of  their  gathering ;  D,  the  weight  from  one  thousand  parts  of 
the  fresh  plants,  dried  at  30°  C;  in  the  cas  eof  extr.  cichor.  and 
tarax.,  the  first  numbers  are  the  results  from  the  roots,  the  se- 
cond from  the  herbs ;  E,  the  quantity  of  water  in  thousands  em- 
ployed in  each  experiment  for  one  thousand  parts  of  the  dry 
plant.  The  following  columns  contain  the  quantity  of  powdered 
extract  obtained  from  one  thousand  parts  of  the  dry  plant,  extr. 
cichor.  and  tarax.  from  equal  weights  of  the  root  and  herb :  1, 
by  maceration ;  2,  by  infusion  for  twenty-four  hours ;  3,  by  two 
decoctions  ;  4,  by  cold  displacement,  extr.  card,  ben.,  liquir.  and 
ratanhae,  with  the  employment  of  the  suction  pump. 
A. 
B. 
C. 
1). 
& 
1 
•I 
3 
-t 
Ext.  Card,  bened. 
"   Cent.  min. 
"   Cinch,  fuse. 
Centaurea  benedicta,  L. 
Gentiana  Centaureum,  L. 
Cortex  Ciuchonse  Loxec. 
before  flowering 
while  in  flowers 
180 
330 
18 
12 
18 
219 
215 
93 
240 
136 
105 
261 
149 
122 
239 
89 
"  Cichorei. 
Cichoioum  intybus,  L. 
(•281 
tise 
12 
245 
214 
209 
"  Dulcamara. 
"    Gentian  se. 
"  Giaminis. 
"   Liquir.  liquid. 
"  Quassise. 
"  Ratanhze. 
"    Rhei  Russ. 
"  Saponar. 
"    Soil!  ee. 
Solanum  dulcamara,  L. 
Gentiana  Pannonica,  Scop. 
Triticum  repens,  L. 
Glycyrrhiza  glabra,  L. 
Quassia  amara,  L. 
Krameria  triandra.  R.  &  Pavon. 
Rad.  Rhei  Russici. 
Saponaria  officinalis,  L. 
Scilla  maritima. 
fall 
fall 
spring 
fall 
spring 
352 
143 
204 
367 
171 
12 
12 
8 
10 
8 
10 
12 
12 
10 
109 
202 
220 
127 
43 
97 
306 
36-1 
107 
28:; 
^'29 
206 
45 
101 
312 
343 
159 
101 
193 
230 
55 
113 
262 
179 
230 
204 
174 
98 
"  Taraxaci. 
*    "  Torment. 
"    Trifolii  fib. 
Leontodon  Taraxacum,  L. 
Tormentilla  erecta,  L. 
Menyanthes  trifoliata,  L. 
fall 
spring 
before  flowering 
C278 
1 187 
282 
I  172 
8 
10 
12 
402 
107 
178 
374 
229 
205 
307 
253 
270 
Centaurea  benedicta  contains  much  sulphate  of  lime,  which 
must  be  separated  by  decantation  before  finishing  the  extract, 
which  in  one  ounce  contains  one  drachm  of  nitrate  of  potassa. 
Extract,  gentianae  ought  to  be  re-dissolved,  filtered,  and  again 
evaporated,  on  account  of  the  pectin.  Extract,  glycyrrh.,  pre- 
pared by  infusion,  keeps  in  the  dry  state  unaltered  without  any 
addition.  Extract,  ratanhae,  prepared  by  displacement  with  the 
suction  pump,  is  entirely  soluble  in  water,  the  residual  root 
yielded  to  boiling  water  62.5  parts  of  dry  extract,  the  greater 
part  of  which  was  insoluble  in  water.  On  account  of  pectine, 
the  preparation  of  extr.  rhei,  by  cold  percolation  is  preferable. 
