Amv2m*£r%f:}£ime  Water  and  Compressed  Lime  Tablets.  563 
44  It  gives  a  strongly  alkaline  reaction  with  litmus  paper." 
44  The  alkaline  reaction  of  the  solution  should  entirely  disappear 
after  it  has  been  saturated  with  carbon  dioxide,  and  subsequently 
boiled  (absence  of  alkalies  and  their  carbonates)." 
"  Fifty  c.c.  of  solution  of  lime  should  require,  for  complete  neu- 
tralization, about  20  c.c.  of  decinormal  oxalic  acid  V.  S.  (correspond- 
ing to  about  0-14  [0148]  per  cent,  of  calcium  hydrate),  phenolphta- 
lein  being  used  as  indicator." 
Twenty-one  samples  were  examined. 
All  of  the  samples  were  found  to  be  alkaline  in  reaction. 
Number  1  contained  alkalies. 
Numbers  3,  5,  12  and  19  were  cloudy  when  purchased. 
Numbers  7,  16,  18  and  20  did  not  clear  with  excess  of  carbon 
dioxide. 
Number  1 1  contained  chlorides  and  sulphates,  for  which  all  of 
the  samples  were  tested.  Phosphates  and  barium  were  absent  from 
all  the  samples. 
The  following  table  gives  the  number  of  cubic  centimetres  of 
decinormal  oxalic  acid  volumetric  solution  required  to  neutralize  50 
cubic  centimetres  of  the  sample  (20  c.c.  being  required  by  the  U.  S.  P.): 
Sample. 
No.  c.c. 
Sample. 
No.  c.c. 
Sample. 
No.  c.c. 
1 
19-8 
8 
20*0 
15 
20*0 
2 
21-6 
9 
i8'5 
16 
21-5 
3 
i8'5 
10      •  | 
2 1 '9 
21'6 
4 
iS-6 
11 
19*2 
18 
22'5 
5 
8-6 
12 
87 
19 
207 
6 
26*1 
■  13 
21-5 
20 
21*3 
7 
iS-5 
u  . 
207 
21 
20-3 
Two  or  three  years  ago,  there  were  placed  on  the  market  com- 
pressed tablets  and  tablet  triturates  of  lime  for  making  official  lime 
water  by  simple  trituration  with  water. 
Samples  of  these  were  procured,  and,  besides  determining  the 
strength  of  the  lime  water  which  they  yielded,  were  examined  in  a 
general  way. 
The  tablets  and  triturates  were  treated  with  water  according  to 
the  directions  accompanying  them  for  preparing  lime  water. 
None  of  the  several  samples  were  entirely  soluble  in  water 
although  number  4  was  almost  completely  dissolved. 
