Am.  Jour.  Pharm.  1 
May,  1910.  J 
Correspondence. 
243 
The  first  specimen  assayed  0.0176  per  cent,  mydriatic  alkaloids,  the 
second  0.02048  per  cent.,  and  the  third  0.0324  per  cent. 
Zinc  Stearate  (C.  E.  Hoffman). — Of  four  samples  examined, 
two  on  ignition  left  a  residue  of  15.5  per  cent.,  one  11.4  per  cent., 
and  the  fourth  9  per  cent.  The  stearic  acid  liberated  from  the  third 
had  a  melting  point  of  6o°  C.  and  that  from  the  fourth  was  yellow 
in  color  and  melted  at  72 0  C. 
A  sample  prepared  from  zinc  acetate  and  soap  met  the  require- 
ments of  the  U.S. P.  A  sample  prepared  by  forming  a  soda  soap 
with  the  stearic  acid  and  treating  this  with  zinc  sulphate  produced 
a  satisfactory  preparation. 
Tincture  of  Iodine  (Ernest  A.  Noedel). — Analyses  of  seven 
samples  of  tincture  of  iodine  obtained  in  Philadelphia  and  vicinity. 
Iodine  per  100  c.c.  ranged  from  4.522  Gm.  to  7.172  Gm.,  average 
6.455  Gm.  One  specimen,  that  containing  the  lowest  amount  of 
iodine,  contained  no  potassium  iodide.  The  others  contained  from 
4.08  Gm.  to  5.16  Gm.  KI  per  100  c.c,  average  4.67  Gm. 
CORRESPONDENCE. 
A  CORRECTION. 
To  the  Editor,  American  Journal  of  Pharmacy  : 
Please  note,  that  in  the  article  about  "  Solubility  of  Alkaloids, 
etc./'  published  in  the  last  issue  of  your  paper,  there  is  a  typo- 
graphical error.  Instead  of  "  quinine  /n-drophosphite  "  it  should 
read  "  quinine  %/>ophosphite."  The  first  named  combination,  of 
course,  does  not  exist,  and  the  error  ought  to  be  corrected. 
Very  truly  yours, 
George  I.  Schaefer. 
April  22,  19 10. 
