486 
The  New  Antidote  to  Arsenic. 
Am.  Jour.  Pharmv 
Oct.,  1880. 
1.  100  grams  of  glycerin,  spec.  grav.  1*25,  were  placed  in  each  of 
four  vessels  of  about  the  capacity  of  200  cubic  centimeters  and  of  the 
diameters  given  in  the  table.  These  vessels  were  placed  in  the  damp 
atmosphere  of  the  cellar,  September  ist,  and  weighed  monthly. 
Weight,  Monthly  Increase. 
Diameter.  ,  '  .  ,  ^ 
Oct.  I,       Nov.  I.       Dec.  i.  Jan.  i.  Oct.    Nov,    Dec.  Jan. 
2*5  cm.    102  gm.    103-7  gin.    103-8  gm.  104-1  gm.    2*0    1*7      -i  •3perct.. 
5*o  116  ii8-  119-25  122-  i6-      2*      1-25  2-75 
7*5  135  138.5  142*7  147-5  35'      3"5    4'2  4'8 
lo-o  150  152-7  155*^5  158-5  50-      27    3-25  3-25 
2.  100  grams  of  glycerin,  spec.  grav.  1*25,  in  a  vessel  5  cm.  in^ 
diameter  and  of  200  cc.  capacity,  and  100  grams  of  distilled  water  in 
another  vessel  of  the  same  size  and  shape,  were  placed  in  a  large  jar 
which  was  then  closely  covered.  On  weighing  the  vessels  monthly, 
the  glycerin  had  increased  and  the  water  decreased,  as  shown  by  the 
table. 
Weight. 
Oct.         Nov.         Dec.        Jan,  Oct.  Nov.  Dec.  Jan, 
Glycerin,  108  gm.  it2-  gm.  114-  gm.  ii5'7gm.  Increase,  8-  4*  2-  i-7prct. 
Water,       90  82-5  75-5         68-3      Decrease,  10-      7-5    7-  7-2 
THE  NEW  ANTIDOTE  TO  ARSENIC. 
By  Phil.  Hoglan,  Ph.G, 
In  the  Journal  for  August,  p.  430,  a  formula  is  given  for  the  pre- 
paration of  the  hydrated  sesquioxide  of  iron,  which  Dr.  McCaw  recom- 
mends in  preference  to  all  others  for  two  reasons,  viz.:  it  forms  the  surest 
antidote,  and  the  ingredients  are  always  accessible.  By  consulting  the 
formula  the  reader  will  see  that  the  second  reason  is  plain,  and  it  was  for 
the  purpose  of  testing  the  accuracy  of  the  first  reason  that  the  following 
experiment  was  conducted.  I  prepared  the  antidote  as  directed  by  mixing 
the  bicarbonate  of  sodium  and  the  water  and  adding  the  tincture  of  iron  ^ 
the  mixture  was  placed  on  a  filter  and  allowed  to  drain  for  a  short  time 
when  a  thick  magma  was  left.  A  small  quantity  of  this  magrqa  was 
mixed  with  a  solution  of  arsenic  containing  half  a  grain  and,  after 
stirring  the  mixture  and  filtering,  not  a  trace  of  arsenic  could  be  discovered 
in  the  filtered  liquid  by  sulphuretted  hydrogen,  or  by  Marsh's  test,  thus 
demonstrating  that  the  formula  in  question  produces  an  antidote,  which, 
is  among  the  surest,  if  indeed,  not  the  surest  of  all  antidotes. 
