262  Solution  of  Chlorinated  Soda.  {Amju°ne"'imrm' 
They  are  given,  however,  because  they  show  that  the  addition  of  an 
extra  amount  of  chlorinated  lime  does  not  raise  the  chlorine  value 
of  the  finished  Labarraque  to  the  normal,  even  when  the  increase 
in  amount  is  directly  proportionate  to  the  deficiency  in  the  chlorine 
strength  of  the  lime. 
Finding  this  plan  of  making  up  the  deficiency  of  commercial 
chlorinated  lime  unavailing,  and  choosing  as  our  main  object  a 
demonstration  of  the  loss  of  chlorine  in  each  of  the  three  stages  of 
the  1890  method,  in  future  experiments  with  the  process  of  1890,. 
we  employed  the  pharmacopceial  amount  of  chlorinated  lime — 75. 
grammes  to  1000  grammes  finished  solution.  Thus  we  try  to  show 
what  would  result  in  the  manufacture  of  Labarraque  by  a  retail  phar- 
macist who  uses  the  best  chlorinated  lime  offered  him  in  the  open 
market. 
In  most  of  the  experiments  the  same  lime  was  employed,  it  being 
titrated  from  time  to  time  to  notice  loss  of  chlorine  on  standing,  the 
exact  chlorine  strength  being  indicated  in  each  case. 
Experiment  C. — Method,  U.S.P.,  1890  ;  100  grammes.  Used  7-5. 
grammes  lime  containing  28-8  per  cent.  CI  =  2- 16  grammes  CI. 
Obtained  42  c.c.  hypochlorite  solution,  97  c.c.  (100  grammes) 
Labarraque,  grammes  lime  residue. 
1  c.c.  Labarraque  required        5    c.c.  —  Thio,  equalling  0-017685  gms.  CI. 
10 
5  c.c.        "  "  25-1  c.c.  ^  Thio,         "  0-887787 
10 
Average,  10  c.c.  Labarraque  contained   0*1772 
"       97  c.c.  "  "   17188 
N 
5  c.c.  hypochlorite  sol.  req.      59*3  c.c.  —  Thio,  equalling  0*209744 
10 
42  c.c.  "    contained   1 761849 
Whole  lime  residue  required     53*6  c.c.  ?  Thio,  equalling  0-18958 
10 
CONCLUSIONS. 
The  lime  contained   2*16    gms.  CI. 
"    hypochlorite  solution  contained   176 
"    Labarraque  contained   17188    "  " 
"    lime  residue      "   -.  •   0-1895    "  " 
Experiment  D. — Method,  U.S.P.,  1890;  1000  grammes.  Used  75 
grammes  lime  containing  28-3  per  cent.  CI  =  21-225  grammes  CI. 
Obtained  450  c  c.  hypochlorite  solution,  1000  grammes  (970  c.c.) 
Labarraque,  grammes  lime  residue. 
