Am'JuOne?l904arrl,'}        Solution  of  Chlorinated  Soda.  265 
Experiment  G. — Method  of  U.S.P.,  1880;  1000  grammes.  Made 
from  80  grammes  lime  containing  28.3  per  cent,  chlorine  ==  22  64 
grammes  CI.  From  this  obtained  805  grammes  (767  c.c.)  Labar- 
raque,  and  195  grammes  moist  lime  residue. 
1  c.c.  Labarraque  required    .  .   6*35  c.c.  ^  Thio,  equalling  0*022459  gm-  CI. 
5  c.c.        "  "  .  .31-8    "    —Thio,        "       0*11247  " 
10 
Average,    10  c.c.  Labarraque  contained  0*22477  " 
767  1 '  "  "   17*2403  gms. 
2  gms.  moist  lime  residue  req'd  12.5  c.c.  ^  Thio,  equalling  0*04421  gm. 
195    "       "       "        "      contained  4*3102  gms. 
CONCLUSIONS. 
The  lime  contained  22*64    gms.  CI. 
"    Labarraque  contained  17*2403    "  " 
"    lime  residue       "   4*3102    "  " 
Since  the  process  of  1880  seemed  to  show  no  chance  of  variation 
when  manufacturing  different  quantities,  no  experiment  involving 
the  manufacture  of  100  grammes  was  made. 
It  will  be  seen  from  the  two  experiments  just  given  that  the 
retention  of  chlorine  by  the  insoluble  lime  residue  is  enough  to 
render  the  process  more  wasteful  of  chlorine  than  that  of  1890. 
Another  objection  is  found  in  the  uncertainty  as  to  the  amount  of 
finished  solution ;  since  the  lime  residue  is  included  in  the  final 
weight  of  the  preparation. 
The  latter  disadvantage  could  be  remedied  in  an  ideal  recipe  by 
washing  the  residue  with  water,  sufficient  to  bring  the  finished  solu- 
tion to  a  definite  weight.  Perhaps  such  washing  may  prove  success- 
ful in  removing  most  of  the  chlorine  from  the  residue,  though  the 
evaporation  of  chlorine  during  washing  is  a  factor  to  be  considered. 
Experiments  based  on  the  lines  just  suggested  are  being  carried 
on  and  will  be  published,  provided  the  Pharmacopoeia  of  1900  does 
not  make  the  much  needed  change. 
CONCLUSIONS. 
(1)  The  process  of  manufacture  of  solution  of  chlorinated  soda 
given  by  the  Pharmacopoeia  of  1890  will  not  yield  in  the  hands  of 
the  average  operator  a  product  of  official  chlorine  strength. 
(2)  It  leads  to  loss  of  chlorine,  and  that  at  every  stage  of  the 
operation ;  part  being  retained  by  the  incompletely  washed  chlorin- 
