70 
SOLUTION  OF  CHLORINATED  MAGNESIA. 
faut,  who  is  said  to  have  obtained  a  yield  of  25  per  cent,  instead 
of  10. 
As  already  observed,  the  sulphur  is  contained  only  in  a  state 
of  mixture  in  the  Romagna  stone,  and  not  being  in  chemical 
combination  with  any  substance,  is  easily  separated  by  fusion. 
The  melting  point  of  sulphur  being  extremely  low,  fusion  may 
be  effected  by  hot-air  or  by  steam,  instead  of  in  kilns  or  even 
heaps,  where  the  excess  of  heat  converts  a  large  portion  of  the 
substance  into  sulphurous  acid.  Taking  advantage  of  this  prop- 
erty of  sulphur,  M.  Brunfaut  employs  an  apparatus  which  con- 
sists of  a  horizontal  cylinder,  containing  an  archimidean  screw 
throughout  its  whole  length.  The  cylinder  is  made  to  revolve 
more  or  less  slowly,  according  to  the  nature  of  the  mineral  to 
be  treated.  The  sulphur  ore  is  poured  in  through  a  funnel  at 
one  end  of  the  cylinder,  and  when  it  has  sufficiently  undergone 
the  action  of  the  apparatus  it  is  led  out  at  the  other  end.  The 
temperature  in  the  cylinder  is  maintained  by  hot-air  or  steam, 
which  is  introduced  under  a  pressure  of  three  atmospheres.  By 
this  machine  150  cubic  metres  of  the  mineral  are  reported  to  be 
disposed  of  in  twenty-four  hours.  This  economical  method  of 
extracting  sulphur  from  its  minerals  is  a  matter  of  great  im- 
portance to  Italy,  which  is  so  rich  in  that  valuable  substance. — 
Jour.  Franklin  Institute,  Oct.,  1867. — Lon.  Mech.  Mag.,  Aug. 
1867. 
SOLUTION  OF  CHLORINATED  MAGNESIA. 
By  Robert  F.  Fairthorne. 
Thinking  that  this  preparation,  from  the  possession  of  certain 
properties,  has  advantages  over  the  solution  of  chlorinated  soda, 
known  by  the  name  of  "  Labarraque's  Disinfecting  Liquid,"  I 
would  suggest  the  following  simple  formula  for  making  the  same  : 
Dissolve  8  ounces  sulphate  of  magnesia  in  two  pints  of  water. 
Triturate  in  a  mortar  4  ounces  and  1  drachm  of  chlorinated  lime 
with  an  equal  amount  of  the  same  fluid.  Mix  the  solutions 
together  and  agitate  occasionally. 
After  standing  twelve  hours  pour  off  the  supernatant  liquid. 
This  consists  of  a  solution  of  chlorinated  magnesia  containing 
a  small  amount  of  sulphate  of  lime.    I  found,  by  adding  solution 
