434 
Stability  of  Digitalis  Leaf  Extracts,  {^.^'^l^ 
The  results  are  plotted  upon  the  following  chart 
re 
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r  1 1 
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Y  T 
p  F 
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r  a 
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3 
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.  ' 
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\- 
\ 
*- 
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D< 
TT5 
FV 
M« 
a 
£ 
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V- 
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\ 
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\ 
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\ 
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T 
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-X 
T* 
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T  1 
4 
° 
\ 
h 
„ 
V 
« 
\ 
V— 
— £ 
% 
r 
r 
1 
S 
J  ( 
f  i 
r  i 
1  a 
J  3 
J 
i  ! 
J  » 
Y  i 
■ 
r 
n 
r  h 
?! 
Fig.  II. 
C.  Stability  of  Dry  Leaves. — From  these  results  given  for  tinc- 
tures and  fluid  extracts,  the  permanency  of  the  drug  as  compared 
to  the  extracts  may  be  plotted.  Reviewing  the  above  data  with  this 
in  view  we  find  that  Drug  D-1625  showed  the  following  values: 
Date. 
Material  Analyzed. 
Drug  Strength, 
.Per  Cent. 
Age  in  Months. 
Dec.  5,  1916  
(sample) 
120 
? 
Feb.  15,  I9I7-  •  
20  gal.  Tinct. 
150 
20  gal.  Tinct.  F.  F. 
136 
6  (in  stock) 
June  13,  I9i7  
20  gal.  Tinct. 
130 
Jan.  12,  1918  
40  gal.  Tinct.  F.  F. 
I00-II3 
13    "  " 
June  29,  1918  
20  gal.  Tinct. 
90 
19    "  " 
40  gal.  Tinct.  F.  F. 
60 
22  " 
Comparing  the  strength  of  fluid  extracts  prepared  during  the 
same  period  and  from  the  same  drug  we  have  about  the  same  curve. 
Date. 
Flex.  No. 
Drug  Strength, 
Per  Cent. 
Age  in  Months. 
30II3 
128 
5 
27799 
113 
13 
38459 
76 
16 
sample  of  drug 
50 
28 
