36 
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 lore- 
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 mgrrns. per litre 
and in grains per gallon. The surface of lead exposed 
measured 5600 sq. mm. 
Table A. 
Lead dissolved by water containing various salts in 
solution. 
Salt. 
Mgms. 
per litre. 
Grains 
per gall. 
Lead dissolved. 
r 
In Mgms. per Litre. 
After 24 48 72 
In Grains per Gallon. 
24 | 48 1 72 hrs. 
Ammonium Nitrate 
20 
1*4 
13-0 
25-0 
0-91 
1*75 
Ditto 
40 
2-8 
15-0 
15-0 
32-0 
1-05 
1-05 
2-24 
Ditto 
80 
5'6 
15-0 
• • • 
1-05 
• • • 
• . • 
Potassium Nitrate 
■\ 20 
P4) 
and 
> and 
and > 
2-0 
2-0 
• • • 
014 
0-14 
• • • j 
Sodium Sulpliate ... 
) 50 
3-5 ) 
Potassium Nitrate 
4 40 
2-8 
and 
> and 
and > 
0-8 
l'O 
1-2 
0-05 
0-07 
0-08 
Sodium Sulpliate ... 
) 212 
14-7 ) 
Potassium Nitrate 
S 45 
3-1 . 
and 
> and 
and > 
• • • 
• • • 
0-3 
• • • 
0-021 
Potass. Carbonate... 
) 305 
21-5 ) 
Potassium Nitrate 
4 70 
5-4 
1 
and 
>and 
and > 
• • . 
• • • 
0-5 
• • . 
. • • 
0-035 
Potassitim Sulphate 
) 504 
35-2 ) 
Calcium Sulphate... 
252 
17-5 
0-4 
0-8 
0-02 
• . • 
0-05 
Ditto 
408 
28*5 
0-4 
• • • 
1-0 
0-02 
• . • 
0-07 
Potass. Carbonate .. 
310 
217 
1 ••• 
0'2 
• . • 
0-014 
Ditto 
516 
36-1 
• • . 
0-2 
0-014 
Calcium Chloride ... 
250 
17-5 
0-5 
0-5 
0‘5 
0-04 
0-04 
0-04 
Ditto 
510 
35 "7 
0-3 
0-4 
0'02 
0.028 
Sodium Sulphate . . . 
200 
14-0 
. i . 
0-8 
• . • 
0-05 
Ditto 
400 . 
28-0 
0-5 
0-03 
Ammonium Nitrate 
) 20 
1-4 ) 
and 
> and 
and > 
• . . 
i • . 
P8 
... 
. . . 
0-126 ! 
Calcium Chloride ... 
) 60 
4-2 ) 
Ammonium Nitrate 
b 20 
i-4q 
Potass. Carbonate 
f 100 
7-0 [ 
0’4 
0-028 
and 
( and 
and ( 
... 
• • • 
' 1 ' 
Sodium Sulphate ... 
j 200 
14-0 J 
Sodium Sulphate 
"'i 200 
14 '°") 
Potass. Carbonate 
f 40 
2-8f 
o-i 
0-007 
and 
C and 
and ( 
... 
t • • 
C 0 • 
Calcium Chloride . . . 
j 100 
7-0j 
Loch Katrine water 
1-0 
DO 
1*5 
0-07 
0-07 
0-105 
Distilled water 
2*0 
2-0 
3-0 
015 
0*15 
1 
0-210 
From this table it is evident that the salts enumerated 
