332 
Fluid  Extracts. 
(  Am.  Jour.  Pharm: 
\       July,  1878. 
100  grams 
of  drug 
used  in 
each  ex- 
periment. 
Extract  in 
j  grams  Di- 
e  Percolate. 
.1   Dry  Ex- 
tct  obtained. 
Specific  Gravity 
of   the  Fluid 
Extract. 
ific  Gravity 
Menstruum  | 
No. 
Name. 
i3th. 
14th. 
15th. 
16th. 
17th. 
18th. 
19th. 
20th. 
Q 
re 
O  — 
H 
CO 
1 
Senna 
•09 
•09 
•08 
■07 
•06 
*c5 
•05 
•05 
75 
35*33 
•954 
2 
•18 
'15 
•13 
•12 
•09 
•04 
•04 
•50 
35  32 
1*095 
•954 
3 
•22 
•15 
•12 
•09 
•08 
•05 
•04 
•04 
•50 
35*48 
1*106 
•954 
4 
(t 
•25 
35^5 
1*142 
•954 
Seneka 
•25 
•18 
•13 
•13 
•12 
•08 
•05 
I'OO 
41*01 
1*086 
•926 
2 
tf 
•25 
•19 
•12 
•25 
•15 
•14 
•IO 
•05 
'25 
42*21 
1*098 
•926 
3 
(t 
'35 
•28 
•15 
74 
•15 
•1 1 
•10 
•08 
•50 
42-o6 
1*095 
•926 
4 
tt 
•50 
40'oo 
1*104 
■926 
Rate  of  Exhaustion. 
No. 
Name. 
1st  5  Percolates. 
2d  5  Percolates. 
3d  5  Percolates. 
4th  5  Percolates. 
500  grams 
Dilute  Percolate. 
Senna 
30  25 
3-55 
•50 
•28 
'75 
2 
« 
30-33 
3'J7 
•98 
•34 
•50 
3 
30*50 
3-14 
I  04 
'30 
•50 
Seneka 
34*25 
4  OI 
1*26 
*49 
I'OO 
2 
« 
33-25 
6*50 
I*52 
•69 
•25 
3 
« 
33'25 
6*13 
i  *6o 
•58 
'5° 
In  the  following  formulas  for  fluid  extracts  in  view  of  the  results 
shown  by  the  foregoing  tables  I  have  omitted  maceration  for  the  seneka 
and  retained  it  for  senna.  Direct  percolation  really  appears  to  be  best 
for  seneka,  and  probably  for  some  other  drugs,  but  I  believe  that  in 
most  cases  maceration  would  be  advantageous. 
Fluid  Extract  of  Serwka. 
Take  of  Seneka,  in  powder  No.  50,  .  .    100  parts 
Water  of  ammonia, 
Alcohol,  s.  g.  '822, 
Water,  each,  a  sufficient  quantity. 
Mix  150  parts  each  of  alcohol  and  water,  add  10  parts  water  of 
