86 
various lengths of time, and the amount of lead which was 
dissolved was estimated at certain intervals ; the method 
employed being the colorimetric one described in the fore- 
going paper. The salts employed, the amounts of each, and 
the amount of lead dissolved after 24, 48, and 72 hours’ 
action are stated in the following table in mgrms. per litre 
and in grains per gallon. The surface of lead exposed 
measured 5600 sq. mm. 
Table A. 
Lead dissolved hy water containing various salts in 
solution. 
Salt, 
Mgms. 
per litre. 
Grains 
per gall. 
I Lead dissolved. 
' In Mgms. per Litre, 
j After 24! 48 t 72 
In Grains per Gallon. 
24 1 48 1 72 hrs. 
Ammonium Nitrate 
20 
1-4 
i 13-0 
25-0 
0-91 
175 
Ditto 
40 
2-8 
! 15-0 
15-0 
32-0 
1-05 
1-05 
2-24 
Ditto 
80 
5-6 
i 15*0 
1-05 
Potassium Nitrate 
20 
1-4 1 
1 
1 
and 
>■ and 
and > 
2-0 
2-0 
0-14 
0-14 
Sodium Sulphate ... 
3 50 
3-5 ) 
Potassium Nitrate 
■) 40 
2-8 
1 
and 
> and 
and > 
1 0*8 
1-0 
1-2 
0'05 
0-07 
0-08 
Sodium Sulphate ... 
3 212 
147 ) 
Potassium Nitrate 
S 45 
3-1 1 
i 
and 
>- and 
and > 
1 
0-3 
0-021 
Potass. Carbonate... 
3 305 
21-5 ) 
Potassium Nitrate 
4 70 
5-4 
and 
1 
and > 
i 
... 
0*5 
0-035 
Potassium Sulphate 
13 504 
35-2 ) 
Calcium Sulphate... 
252 
17'5 
I 0-4 
0-8 
0-C2 
0‘05 
Ditto 
408 
28-5 
! 0-4 
1-0 
0-02 
i * * * 
0-07 
Potass. Carbonate .. 
310 
217 
0-2 
1 
... 
0-014 
Ditto 
516 
36-1 
0-2 
1 ... 
0-014 
Calcium Chloride ... 
250 
17-5 
b-5 
b-5 
0-5 
b-b4 
0-04 
0-04 
Ditto 
510 
35-7 
1 0-3 
! 
0-4 
0-02 
0.028 
Sodium Sulphate ... 
200 
14-0 
' ... 
!!! 
1 0-8 
0-05 
Ditto 
400 
28-0 
... 
0-5 
1 0-03 : 
Ammonium Nitrate 
) 20 
1-4 ) 
1 
1 
! 
and 
> and 
and > 
! 
... 
1 1-8 
0-126 
Calcium Chloride ... 
) 60 
4-2 ) 
! 
Ammonium Nitrate 
'A 20 
l'4b 
I 
Potass. Carbonate 
and 
f 100 
t and 
7-0 / 
and f 
... 
... 
0-4 
0-028 
Sodium Sulphate ... 
J 2 OO 
14-0 ) 
Sodium Sulphate 
200 
14-0^ 
Potass. Carbonate 
( 40 
2-8 ( 
O'l 
and 
1 and 
and ( 
.... 
U Uv/ 
Calcium Chloride ... 
3 100 
7-o; 
1 
Loch Katrine Avater 
1-0 
1-0 
1-5 
0-07 
0-07 ; 
0-105 
Distilled water 
2-0 
2-0 
3-0 
0-15 
0-15 ! 
0-210 
From tins table it is evident that tlie salts enumerated 
