Am.  Jour.  Phariu. ) 
October,  1909.  j 
Assay  of  Heart  Tonics. 
469 
F.  E.  Squill. 
I    5o 
6   20 
3    4i 
28    12 
11    66 
Average  for  4  samples,  44  H.  T.  U.S. 
Tincture  Strophanthus. 
10                                                  ...  1200 
6    1333 
22    666 
1    1 200 
3    400 
B.  P. 
23    333 
14   167 
24    300 
15  •  ••   333 
25    333 
26    533 
13    l67 
27    167 
1    333 
6    266 
Averages,  400,  1100,  and  R.  P.  300  H.  T.  U.s  per  Cc. 
TABLE  V. 
ASSAYS  OF  12  CONSECUTIVE  LOTS  OF  CRUDE  DIGITALIS  LEAVES  SUBMITTED  FOR 
PURCHASE. 
Fluid  Extract  Made  According  to  7th  Revision,  U.  S.  P. 
Per  cent  of  standard.  H.  T.  U.s  per  Cc.      Per  cent  of  standard.  H.  T.  U.s  per  Cc. 
100  66  75  50 
80  50  60  40 
120  80  70  46 
75  50  100  66 
125  82  125  82 
200  132  75  50 
Average  for  12  samples, -66 
Activity  compared  with  the  proposed  standard:  Minimum  fatal  dose  per 
Gm„  0.0015  Cc.  —  66  11.  T.  U.s  per  Cc 
In  view  of  the  results  we  have  already  obtained,  and  particularly 
those  regarding  the  digitalis  preparations,  we  strongly  recommend 
that  at  the  time  of  manufacture,  after  proper  aging,  preparations 
of  digitalis  be  assayed  and  a  statement  be  made  on  the  label,  stating 
when  the  assay  was  made  and.  the  number  of  H.T.U.s  contained 
per  cc.  Such  number  of  H.T.U.s  should,  of  course,  be  the  number 
selected  as  of  standard  potency;  in  other  words,  hold  the  finished 
product  to  a  standard  of  uniform  activity.    It  would  be  very  desir- 
