ies  of  oxidation  products  from  camphor.  By  boiling  the  ammonium  com-
pound with  moderately  concentrated  nitric  acid,  they  obtained  a  compound
which  separates  from  acetic  acid  in  fine  orthorhombic  prisms,  melts  at
188^-189'',  has  a  composition  approximating  to  the  formula  CjoHijSOiBrj,
and  appears  to  be  a  sulpholactone  derived  from  a  hydroxydibromcamphor-
sulphonic  acid  by  the  elimination  of  one  molecular  proportion  of  water.  As
the  result  of  a  number  of  operations  upon  the  acid  filtrate  resulting  from
the  separation  of  the  sulpholactone^  two  additional  crystalline  substances
have  so  far  been  obtained.  The  one  is  a  sulphonic  acid  which  crystallizes
from  a  mixture  of  methyl  alcohol  and  ethylic  acetate  in  pyramidal  form,
melts  at  156°- 15  8°  with  evolution  of  gas,  is  very  soluble  in  water,  and  sep-
arates from  this  in  hydrated  crystals  melting  at  i28°-i33°.  Its  composi-
tion corresponds  to  that  required  for  the  formula  of  a  hydroxyldibromo-
camphorsulphonic  acid — CioHuSOtBra.  The  other  compound  is  apparently
the  ammonium  dihydrogen  salt  of  ^^-sulphocamphonic  acid,  it?  composition
agreeing  fairly  with  the  formula  C10H15O4SO2ONH4.  It  separates  from
alcoholic  ethyl  acetate  in  microscopic  plates,  is  extremely  soluble  in  water,
but  nearly  insoluble  in  cold  acetone.  A  crystalline  compound,  apparently
a  sulphonic  bromide  derived  from  hydroxydibromocamphorsulphonic  acid
has  been  separated,  but  requires  further  examination. — Chem.  News,  May
I,  1896,  208.
