Am'juiyr,'£94arm'}  Solution  and  Tincture  of  Ferric  Chloride.  327 
paratively  few  pharmacists  comply  with  that  part  of  the  process 
where  it  is  directed  to  stand  three  months ;  accordingly  such  pro- 
ducts are  deficient  in  diuretic  properties. 
When  the  samples  were  collected  one  store  was  found  to  be  out 
of  the  tincture  entirely.  The  proprietor  immediately  proceeded  to 
supply  my  wants  with  an  extemporaneous  preparation.  The  public 
at  large  might  take  pride  in  securing  a  freshly  prepared  article,  but 
it  surely  is  not  what  should  be  expected  by  those  knowing  its 
properties. 
The  following  table  gives  the  results  of  a  comparative  analysis  of 
the  tincture  as  found  in  the  retail  store  : 
Tabi^e  II. — Examinations  of  Tincture  of  Ferric  Chxoridf,. 
Sample  No. 
Specific 
Gravity. 
Fe2Cl6 
Per  Cent. 
Parts  by  Weight 
of  the  Solution 
used  in  making 
the  Tincture. 
Made  from  Solution 
Number 
HNO3 
Ferrous 
Salt. 
i,  .... 
•980 
13*15 
35 
1 
0 
slight 
2,  .... 
•987 
IO  "OO 
26-6 
2 
0 
slight 
3,  .... 
'972 
11-52 
0 
0 
4,    •  •  • 
•980 
13-80 
0 
trace 
5  
•980 
*3*33 
trace 
0 
6,  .... 
1:028 
17-09 
45 
4 
slight 
0 
7,  .... 
•927 
10-25 
28-6 
7 
0 
decided 
8,    .  .  . 
•948 
11-50 
slight 
0 
9>  .... 
1-032 
11-31 
0 
much 
10,  .... 
1-031 
12-68 
33-6 
6 
0 
much 
11,  .... 
1-030 
1071 
29 
3 
trace 
0 
12,  .... 
•972 
13 '°3 
much 
0 
Average, 
•989 
12-36 
All  the  samples  were  collected  before  the  introduction  of  the  new 
Pharmacopoeia,  and  should,  therefore,  contain  13-25  per  cent,  of 
anhydrous  ferric  chloride  and  have  a  specific  gravity  of  -980.  The 
new  Pharmacopoeia  has  modified  the  formula  for  making  the  tincture 
somewhat,  altering  the  specific  gravity  and  percentage  of  anhy- 
drous ferric  chloride. 
No  relationship  exists  in  above  table  between  specific  gravity  and 
