Air..Tour. Pharm.  ) 
Dec.  1882.  J 
Effect  of  Ozone  on  Metallic  Salts. 
6ir 
petroleum  spirit  0*38  gram,  which  in  the  water  bath  decreased  to  0*27 
gram,  representing  0*11  gram  of  essential  oil.  The  0*27  gram  of  res- 
idue indicated  66  per  cent,  of  Peru  balsam.  (41:100.)  1  gram  of 
the  same  sample  gave  when  treated  with  ammonia  solution  0'17  gram 
of  solid  resin,  which  added  to  the  0*11  gram  of  essential  oil  made  a. 
total  of  0*28  gram,  or  28  per  cent,  of  copaiba  balsam. 
b.  A  more  simple  and  sufficiently  exact  method  is  to  shake  (he  sam- 
ple repeatedly  with  petroleum  spirit,  and  to  weigh  the  undissolved 
portion  after  drying  at  100°C.,  and  the  dissolved  portion  after  evap- 
oration of  the  spirit  at  the  ordinary  temperature.  The  undissolved 
portion  amounts  to  a  good  half  of  the  Peru  balsam,  and  by  subtract- 
ing the  amount  from  that  of  the  evaporation  residue,  an  approxima- 
tion to  the  quantity  of  copaiba  balsam  is  obtained. 
Example. — 1  gram  of  Peru  balsam  containing  30  per  cent,  of  added 
copaiba  balsam,  left  after  shaking  with  petroleum  spirit  0'35  gram  undis- 
solved, or  equal  to  70  per  cent,  of  Peru  balsam.  The  petroleum 
spirit  left  upon  evaporation  0*65  gram.  Consequently  0*65 — 0*35=0.30 
gram  (30  per  cent.)  of  copaiba  balsam. — Phar.  Jour,  and  Trans.,  Oct. 
21,  1882,  from  Arckiv  der  Fharmacie. 
ACTION  OF  OZONE  ON  METALLIC  SALTS  AND  OXIDES. 
By  Mailfert. 
Mercurous  Salts. — The  nitrate  is  entirely  decomposed  by  ozone,  with 
formation  of  mercuric  nitrate  and  a  yellow  precipitate  of  trimercuric 
nitrate.  The  sulphate  behaves  in  a  similar  manner,  mercuric  sulj)hate 
and  basic  sulphate  being  formed.  Mercurous  chloride  is  acted  on 
somewhat  more  slowly  with  formation  of  mercuric  chloride,  and  a 
brick-red  precipitate,  apparently  an  oxychloride.  The  bromide  is  acted 
on  in  a  similar  manner.  With  the  iodide  the  action  is  extremely  slow, 
mere  traces  of  red  precipitate  being  produced  even  after  the  ozonized 
gas  had  been  passed  for  15  hours. 
Silver  Salts. — With  the  nitrate^  a  bluish-black  flocculent  precipitate 
of  peroxide  is  produced,  which,  however,  is  decomposed  and  redis- 
solved  on  agitating  the  solution.  The  sulphate  likewise  gives  peroxide, 
but  the  chloride  and  cyanide  are  only  very  slowly  acted  on. 
Palladium  Salts. — The  nitrate,  chloride,  and  protoxide  give  the 
dioxide  by  the  action  of  ozone.  The  protoxide,  in  presence  of  potas- 
sium hydroxide,  gives  potassium  palladate. 
