390 
PKEPARATION  OF  IODIDE  OF  AMMONIUM. 
which  the  acid  reaction  was  due,  and  on  evaporation  there  was 
left  the  golden  yellow  resin  already  described. 
The  part  left  after  the  action  of  ether  was  dissolved  in  alco- 
hol, and  treated  with  a  solution  of  acetate  of  lead,  to  precipi- 
tate some  other  resin,  and  the  filtrate  deprived  of  lead  by  hy- 
drosulphuric  acid.  The  colorless  solution  thus  obtained  possessed 
an  intensely  bitter  taste.  It  is  abundantly  precipitated  by  sub- 
acetate  of  lead ;  phospho-molybdic  acid  caused  a  flocculent 
whitish  precipitate.  It  is  soluble  in  water,  ether  and  alcohol, 
and  is  not  crystallizable.  It  is  a  neutral  body,  possessing  nei- 
ther acid  nor  alkaline  reaction.  It  is  reddened  by  strong  nitric 
acid,  and  converted  into  a  substance  possessing  acid  properties. 
Sulphuric  acid  dissolves  it  without  production  of  color.  Both 
acids  destroy  the  bitter  taste  of  the  principle  Euonymin. 
From  the  foregoing  analysis,  the  bark  of  Euonymus  Atro. 
purpureus  may  be  said  to  contain  the  following  constituents : 
Organic  Constituents  Uncomhined. — Euonymin,  Asparagin, 
Soft  Resin,  Crystallizable  Resin,  Yellow  Resin,  Brown  Resin, 
Fixed  Oil,  Wax,  Starch,  Albumen,  Glucose,  Pectin. 
Organic  Acids  in  Combination  with  Lime  and  Magnesia. — 
Malic  Acid,  Euonic  Acid,  Citric  Acid,  Tartaric  Acid. 
Inorganic  Salts  Phosphate  of  Lime,  Sulphate  of  Potassa, 
Chloride  of  Potassium,  Sulphate  of  Lime,  Phosphate  of  Iron, 
Phosphate  of  Alumina,  Oxide  of  Iron,  Silicious  Residue. 
La  Crosse,  Wisconsin,  July  15th,  1862. 
ON  THE  PREPARATION  OF  IODIDE  OF  AMMONIUM. 
By  Wilson  H.  Pile,  M.  D. 
There  are  two  methods  of  preparing  this  article  usually  given 
by  chemical  writers.  One  is,  to  proceed  as  in  making  iodide 
of  potassium,  first  forming  an  iodide  of  iron,  and  then  by  the 
addition  of  ammonia,  throwing  down  the  sesqui-oxide  of  iron 
and  leaving  the  iodide  of  ammonium  in  solution.  Made  in 
this  way,  the  product  is  generally  dark  colored.  The  second 
and  more  preferable  method  is  by  first  making  hydriodic  acid 
and  then  saturating  it  with  ammonia.  The  objection  in  this 
latter  case  is  the  necessity  of  first  preparing  the  acid,  a  very 
disagreeable  process,  involving  the  use  of  sulphuretted  hydrogen 
