344 
Rapid  Determination  of  Sulphuric  Acid.^ 
Am. Jour.  Pharlu. 
.Iiilv,  1911. 
because  it  fully  eliminates  the  filter  paper  process,  which  is  one  of 
the  most  objectionable  features  in  most  of  the  chemical  procedures 
and  analytical  work  of  all  kind,  every  chemist  will  welcome  this  por- 
ous crucible  because  we  all  know  the  difficulty  in  burning  filters,  in  re- 
gard to  the  ashes  and  at  last,  but  not  least,  the  reducing  action  of 
the  carbon  of  the  filter  which  is  highly  objectionable,  especially  in 
the  sulphur  determination.  These  and  many  other  objections  which 
are  daily  observed  in  regard  to  these  methods  have  led  me  to  devise 
a  new  porous  crucible  which  enables  the  chemist  to  make  a  dozen  or 
even  more  sulphur  determinations  in  comparatively  the  same  length 
of  time  spent  to  make  a  single  filter  determination  considering  all 
points  of  importance  in  regard  to  boiling  and  addition  of  barium 
salts,  etc. 
Taking  the  advice  of  "  Hintz  "  and  Weber  "  in  their  extensive 
study  of  this  especial  method,  if  we  operate  under  the  same 
caution  and  condition,  there  arises  one  and  the  same  inaccuracy 
which  can  be  tolerated  in  this  method  and  by  the  other  methods 
and  greatly  increase  the  accuracy  after  all. 
t 
HEAVY  RUBBER 
TUBING 
HEAVY 
^RUBBER 
TUBING 
FIG  3 
