564  Lime  Water  and  Compressed  Liwe  Tablets.  {^vimbefSf' 
Fifty  c.c.  of  the  mixture,  which  was  obtained  when  the  tablets  or 
triturates  were  rubbed  with  the  quantity  of  water  directed,  were 
titrated  with  the  oxalic  acid  solution.  After  this,  some  of  the  mix- 
ture was  filtered  and  50  c.c.  of  the  clear  filtrate  were  likewise 
titrated. 
The  following  results  of  the  titrations  are  stated  in  the  number  of 
cubic  centimetres  of  decinormal  oxalic  acid  volumetric  solution  re- 
quired for  the  50  c.c.  titrated  (20  c.c.  being  required  by  theU.  S.P.): 
Sample. 
Form. 
No.  c.c. 
for  50  c.c.  Product.  ■ 
Cloudy. 
Filtered. 
1 
tablet 
1*2 

2 
(< 
8-8 
3 
tablet  triturate 
IO"2 
87 
4 
tablet 
IO'I 
5 
27 
2'I 
All  of  the  samples  contained  carbonates.  All  were  free  from  sul- 
phates, chlorides,  phosphates  and  alkalies. 
Number 4  was  completely  dissolved  by  diluted  hydrochloric  acid; 
the  other  samples  were  not  entirely  soluble  in  this  liquid. 
Number  2  contained  magnesium.  Glucose  was  not  present  in 
any  of  the  samples.  Cane  sugar  was  found  in  numbers  2,  3,  4  and 
5.  Starch  was  detected  in  number  5,  which  tablet  yielded  a  pro- 
duct  that  had  but  a  slightly  alkaline  reaction  towards  litmus. 
Traces  of  iron  were  found  in  numbers  2,  3  and  4. 
The  cane  sugar  had  probably  been  introduced  as  a  diluent  in  the 
making  of  the  tablets.  Additional  quantities  of  this  substance  were 
added,  in  order  to  ascertain  whether  it  would  increase  the  strength 
of  the  lime  water  by  dissolving  any  calcium  hydrate  that  might  have 
failed  to  dissolve  in  the  water  supplied ;  but  as  no  such  effect  was 
observed,  it  would  appear  that  the  remaining  calcium  had  assumed 
the  form  of  carbonate. 
The  results  of  these  examinations  show  that  but  little  of  the  lime 
water  dispensed  is  of  the  strength  required,  and  that  official  lime 
water  was  not  obtainable  from  any  of  the  tablets  or  tablet  triturates 
examined. 
