Am.  Jour.  Pharm.  I 
October,  1909.  / 
Assay  of  Heart  Tonics. 
471 
siderable  trouble  in  our  laboratory  for  many  years,  so  much  so  that 
we  have  found  it  necessary  to  carefully  test  out  each  lot  of  glass 
tubing  before  it  is  used  for  test-tubes  for  culture  media  purposes. 
It  might  be  thought  on  considering  Table  V,  since  the  results 
check  up  so  closely  with  the  proposed  standard  for  fluidextract  digi- 
talis, that  the  same  figures  had  been  used  in  both  cases.    This,  how- 
TABLE  Vll. 
FLUID  EXTRACT  SQUILL,  ?TH  REVISION. 
No. 
M.  F.  D. 
Units. 
.0006 
166 
.OOOJ 
142 
.0008 
.0009 
III 
.OOIO 
100 
.0011 
91 
.OOI2 
83 
.0013 
76 
OOI4 
71 
.OOI5 
66 
.0016 
62 
.0018 
55 
.OOI9 
52 
.0022 
45 
.0024 
41 
•0025 
40 
.0032 
3i 
■0035 
28 
.OO38 
26 
.0040 
25 
.0050 
20 
.0056 
17 
.OO65 
15 
Summary — Fluid  Extract  Squill,  U.  S.  P.  7th  Rev. 
!   '  H.  T.  U.s 
M.  F.  D.  per  Cc. 
Standard  adopted  in  1901  0012  83 
Average  for  61  samples   80 
Proposed  standard  for  7th  Rev.  U.  S.  P   80 
ever,  is  not  true,  as  the  samples  mentioned  in  Table  V  were  simply 
worked  out  in  the  course  of  every-day  laboratory  testing,  recorded 
in  a  book  kept  for  that  purpose,  and  were  taken  off,  as  intimated, 
consecutively,  merely  to  illustrate  the  variability  in  the  activity 
of  crude  digitalis  leaves  as  they  appear  on  the  market. 
These  figures  were  derived  in  a  manner  similar  to  that  used 
for  the  derivation  of  the  minimum  fatal  dose  for  the  standard  tinc- 
ture of  strophanthus,  as  previously  stated.  Reference  to  the  follow- 
ing synopses  dealing  with  strophanthus,  digitalis,  squill,  and  con- 
