14  Gaultherifl.  /Am.  Jour.Pharm. 
January,  1895. 
The  tabulated  statement  of  the  behavior  of  the  samples  with  the 
official  tests  is  as  follows : 
h 
"> 
with 
after 
with 
hlor- 
ates). 
abso- 
.  by 
>ecific  Gra 
iscibility 
alcohol. 
;sidue  left; 
;vaporatio 
■ecipitate 
barium  c 
ide  (Sulph: 
:r  Cent,  of 
lute  HBr 
titration. 
Remarks. 
VH 
Xli 
% 
Ph 
IN  O.  I 
1*090 
ppt. 
7-14  p.  c. 
turbid 
11*42 
lviaue  Dy  r  otn- 
ergill's  pro- 
cess. 
No.  2    .    .  . 
I -077 
clear 
none 
ppt. 
io'6o 
No.  3  ... 
1-106 
clear 
slight 
ppt. 
14-04 
Contained  free 
H2S04. 
No.  4   .  .  . 
1-087 
clear 
1  p.  c. 
none 
11-50 
No.  5   •  •  • 
I -077 
clear 
none 
ppt. 
10-50 
No.  6  ... 
I  080 
clear 
slight 
ppt. 
12-72 
Contained  free 
H2S04. 
The  presence  of  sulphates  in  all  of  the  samples  examined,  except- 
ing the  fourth,  would  indicate  that  impure  potassium  bromide  had 
been  used  in  their  manufacture,  or  that  the  acids  had  been  made  by 
Hager's  process  (Nat.  Disp.,  page  58)  and  an  excess  of  sulphuric  acid 
used.  The  former  view  is  more  likely  to  be  correct  in  the  cases  of 
samples  2  and  5,  as  they  contained  no  free  sulphuric  acid.  In 
the  August  number  of  the  American  Journal  of  Pharmacy  for 
1894,  an  article  is  published  entitled  "  Potassium  Iodide  and  Bromide 
of  the  Market — Do  They  Come  up  to  the  Requirements  of  the  Phar- 
macopoeia? "  and  it  is  a  significant  fact  that  only  three  of  the  eight 
samples  of  potassium  bromide  that  were  examined  were  entirely  free 
from  sulphates. 
305  Cherry  Street,  Philadelphia. 
A  REVIEW  OF  GAULTHERIN,  THE  GLUCOSIDE  FROM 
BETULA  LENTA,L.  _ 
By  Frank  X.  Moerk.  Ph.G. 
At  the  Pharmaceutical  meeting  held  in  the  Philadelphia  College 
of  Pharmacy,  December  4,  1843,  a  paper  was  read  by  William 
Procter,  Jr.,  entitled  "  Observations  on  the  Volatile  Oil  of  Betula 
Lenta,  and  on  Gaultherin,  a  Substance  Which,  by  Its  Decomposi- 
tion, Yields  That  Oil."  The  important  points  of  that  paper  may  be 
