AFebJrXrya9aorom'}       Two  Toxico  logical  Investigations.  87 
metallic  rings  or  mirrors  were  readily  oxidized  to  arsenic  trioxide. 
The  remaining  one-half  of  the  stomach  contents  was  taken  for  the 
quantitative  determination  of  the  arsenic.  This  was  mixed  with 
5  c.c.  hydrochloric  acid  and  50  c.c.  distilled  water  and  warmed  and 
strained,  and  the  residue  again  washed  with  water  acidified  with 
hydrochloric  acid,  the  strained  liquids  mixed,  filtered  and  precipi- 
tated with  hydrogen  sulphide.  The  sulphide  was  purified  by  solution 
in  ammonium  hydroxide,  and  reprecipitated  with  hydrochloric  acid 
in  the  presence  of  a  few  drops  of  hydrogen  sulphide  solution,  the 
solution  and  reprecipitation  being  repeated  until  it  was  free  from 
organic  matter.  The  purified  sulphide  was  then  dried  and  washed 
with  carbon  disulphide,  then  with  petroleum  ether,  dried,  finally 
dissolved  off  the  filter  with  ammonium  hydroxide  and  evaporated 
on  a  tared  watch  crystal.  The  yield  of  arsenic  sulphide  was  1 
gram,  equivalent  to  2  48  grains  of  arsenious  acid,  for  the  entire 
stomach  contents. 
In  order  to  apply  Marsh's  test,  a  portion  of  the  sulphide  was 
oxidized  in  a  porcelain  crucible  with  nitric  acid,  and  then  fused  with 
sodium  carbonate  and  sodium  nitrate.  The  fused  mass  dissolved  in 
water,  acidified  with  sulphuric  acid,  and  evaporated  until  fumes  were 
given  off,  and  then  cooled,  and  diluted  with  water.  This  solution 
containing  arsenic  as  sodium  arseniate,  was  used  in  the  Marsh's 
test,  and  a  few  drops  were  sufficient  to  give  beautiful  tube  and  plate 
mirrors  of  arsenic. 
Stomach  Wall. — The  membrane  of  the  stomach,  or  stomach 
wall,  was  cut  up  into  small  pieces  and  digested  in  a  water  bath,  by 
the  method  proposed  by  Fresenius  and  Babo,  using  100  c.c.  water 
and  40  c.c.  pure  hydrochloric  acid  and  potassium  chlorate  grad- 
ually added,  until  a  clear  solution  resulted.  This  was  filtered  and 
warmed  until  the  odor  of  chlorine  was  dissipated,  and  the  arsenic 
then  precipitated  as  sulphide,  and  the  sulphide  purified  from  sul- 
phur and  organic  impurities  in  the  same  manner  as  that  obtained 
from  the  stomach  contents.  The  results  calculated  as  arsenic 
trioxide,  gave  3-348  grains  obtained  from  the  stomach  wall. 
Ike  Liver. — Simultaneously  with  the  examination  of  the  stomach 
contents,  a  portion  of  the  liver  was  tested  for  organic  poisons,  with 
negative  results.  One-half  of  the  part  of  the  liver  was  utilized  for 
the  determination  of  arsenic,  and  the  method  of  Fresenius  and 
Babo  was  found  satisfactory.     The  sulphide,  however,  contained  a 
