206 
DE.  H.  DEBUS  ON  THE  ACTION  OF  AMMONIA  ON  GLTOXAE. 
2.  Oxalate  of  ammonia  causes  the  formation  of  smaR  crystals  of  the  oxalate. 
3.  Iodide  of  potassium  and  sesquichloride  of  iron  produce  no  change. 
4.  Chloride  of  copper  gives  a precipitate  of  fine  green  crystals,  radiating  from  one  centre. 
5.  Nitrate  of  silver  gives  a white  precipitate,  insoluble  in  nitric  acid. 
6.  Chloride  of  mercury  throws  down  a white  crystalline  powder,  soluble  in  dilute 
hydrochloric  acid. 
The  following  experiments  were  made  to  determine  the  composition  of  glycosine : — 
0'211  grm.,  dried  over  sulphuric  acid,  treated  according  to  Will  and  Vaeeextrapp’s 
method,  gave  1-407  grm.  chloroplatinate  of  ammonium.  The  latter  left,  after  ignition, 
the  quantity  of  platinum  required  by  the  formula  NHg  H Cl  d-PtClg.  Special  experi- 
ments were  made  to  prove  the  purity  of  the  materials  employed.  The  carbon  and 
hydrogen  determination  was  lost,  and  want  of  material  prevented  me  from  repeating 
the  combustion.  100  parts  of  glycosine  contain,  therefore. 
Nitrogen 41-90. 
Under  the  supposition  that  the  formation  of  the  substance  took  place  according  to 
4C,H,0,)+3/(NH3)±4H,0), 
I can  only  calculate  the  formula  Cg  Hg  N4,  which  requires 
Nitrogen 41-79 
Chloroplatinate  o/‘^/3/cosme=CgHgN4,  2HCl+2Pt  Clj. 
Bichloride  of  platinum  was  added  by  degrees  to  a concentrated  solution  of  hydrochlo- 
rate of  glycosine.  At  first  a light  brown,  and  afterwards  a fine  yellow  precipitate  was 
produced.  The  reason  of  this  is,  that  the  hydrochlorate  of  the  base  unites  in  more 
than  one  proportion  with  bichloride  of  platinum.  In  order,  therefore,  to  obtain  a pure 
compound,  the  liquid  was  filtered  as  soon  as  the  precipitate  assumed  a bright  yellow 
colour,  and  bichloride  of  platinum  in  excess  added  to  the  filtrate.  Thus  a homogeneous 
powder  of  yellow  crystals  was  obtained. 
This  salt,  dried  over  sulphuric  acid,  was  employed  in  the  following  experiments : — 
0-458  grm.  left  after  ignition  0-166  grm.  platinum. 
0-356  grm.,  burnt  with  chromate  of  lead,  gave  0-179  grm.  carbonic  acid  and  0-051  grm. 
water. 
0-625  grm.,  burnt  with  lime,  gave  0-968  grm.  of  chloride  of  silver. 
0-997  grm.,  burnt  with  soda-lime,  gave  1-648  grm.  chloroplatinate  of  ammonium. 
In  100  parts- — 
Carbon  . . 
....  13-71 
Hydrogen  . 
....  1-59 
Nitrogen 
....  10-38 
Chlorine . . 
....  38-29 
Platinum 
....  36-24 
100-21 
