468 
Assay  of  Heart  Tonics. 
j  Am.  Jour.  Fharm 
(     October,  1909. 
final  results  will  be  published  as  soon  as  possible  with  data  relative 
to  the  deterioration  of  the  other  members  of  the  heart  tonic  series. 
TABLE  IV. 
POTENCY  OF  PREPARATIONS  OF  HEART  TONICS  AS  PURCHASED  ON  THE  OPEN  MARKET. 
Fluid  Extracts  of  Digitalis. 
H.  T.  U.s  per  Cc. 
No.  of  manufacturer.  U.  S.  P.  7th  Rev.         U.  S.  P.  8th  Rev. 
1   •   33  19 
22 
33 
2    82 
56 
3  •   66  33 
4   ■  ■  •   46 
5    46 
6   66  40 
40 
66 
7    50 
88 
50 
8    33 
33 
9    88 
10    13 
11    26 
Average  for  17  samples  U.  S.  P.  7th  Rev.,  53  H.  T.U.s  per  Cc. 
Average  for  5  samples  U.  S.  P.  8th  Rev.,  26  H.  T.  U.s  per  Cc. 
English  Manufacturers. 
12    _;o 
13    33 
14    53 
15    16 
16     50 
17    33 
18   26 
19    30 
20    26 
Average  for  9  samples,  34  H.  T.  U.s  per  Cc. 
Tincture  of  Digitalis,  U.  S.  P. 
Standard  1/10  Potencv  of  F.  E.  Digitalis. 
3    6 
2    6 
Extract  of  Digitalis. 
Standard  3  Times  Potency  of  F.  E.  Digitalis. 
6    150 
1 10 
2    170 
Average,  150  H.  T.U.s  per  Gm. 
