Sulphur  Monobromide,  SaBrg,  is  the  only  compound  of  these  two  elements
known  at  the  present  time.  It  is  prepared  by  the  direct  union  of  the  elements,  the
excess  of  bromine  being  rcmoven  by  carbon  dioxide.  It  is  a  heavy,  red  liquid,
which  is  stable  at  ordinary  temf)eratures,  but  decomposes  slowly  at  the  boiling
j)oint,  200°  to  210°,  into  sulphur  and  bromine.
SULPHUR    AND    IODINE.
These  two  elements  unite  in  two  proportions.
Sulphur  Moniodide,  Sala.  is  formed  when  the  two  elements  are  heated  together
under  water,  or,  according  to  the  Pharmacopoeia,  without  water  in  a  loofidy-
stopiK^red  Hask.  They  arc  directed  to  be  first  thoroughly  mixed  and  then  gently
heated  until  the  mass  Ix^comes  of  a  uniform,  dark  color,  when  the  temperature  ]f
increased  to  the  ]K)int  necessary  to  melt  them.  Thus  prepared,  Sulphuris  lodidnm,
U.S. P.,  is  a  grayish-black,  crystalline  S(jJid,  with  the  characteristic  odor  of  iodioe.
having  a  .somewhat  acrid  taste  and  a  slightly  acid  reaction.  It  is  insoluble  in  water.
soluble  in  sixty  parts  of  glycerin,  and  very  soluble  in  carbon  disulphide.  Alcohol
and  ether  remove  the  iodine,  leaving  the  sul]>hur.  It  is  gradually  decomposed  00
exjM)sure  to  the  air,  with  loss  of  iodine.  On  the  application  of  heat  it  melts  at  60*.
and  at  a  higher  teni[>erature  sublimes  with  partial  decomposition,  without  leaving
any  residue.  Pn)loniied  l)oiling  with  water  removes  the  iodine,  which  escapes  witn
the  steam,  leaving  the  suli>hur.
Sulphur  hexiodide.  Sle.  is  obtained  by  evaporating  a  solution  of  the  two  element!
in  carnon  disulphide.  when  crystals  similar  to  those  of  iodine  separate.
SULPHUR  AND  OXYGEN.
*i3


SULPHUR   AND   OXYGEN.
The  following  compounds  of  these  two  elements  are  known :
Sulphur  Sesquioxide,  (Disulphiu*  Trioxide)  Sfiy
Sulphur  Dioxide,  (Sulphurous  Anhydride)  SO^j.
Sulphur  Trioxide,  (Sulphuric  Anhydride)  SO3.
Sulphur   Heptoxide,  (Persulphuric  Anhydride)  Sfi^.
