4 
D. — Experimeitts carried out in Corked Flasks nearlt filled 
WITH LIQUID (SOOcbc.) THROUGH WHICH A STREAM OF AIR WAS 
CONTINUALLY PASSED. 
Nature of Solution. 
Grams 
per 
Litre. 
Surfaces 
of Lead 
exposed 
in sq.cm. 
Total Lead in Milligrams in Solution in the 
Liquid after 
42 
hours 
68 
hours 
70 
hours 
138 
hours 
140 
hours 
168 1 336 1 340 
hours , hours hours 
. 1 
505" 
hours 
Distilled Water 
Potassium Nitrate .... 
51 • • • • 
Calcium Chloride 
0’i32 
0*20 
0-20 
0-20 
55 
25 
25 
240 
25 
50 
25 
50 
25 
60 
0-8 
3-5 
0-5 
0-4 
0- 5 
1- 3 
0-7 
3-5 
0-5 
0-6 
0- 5 
3-0 
1- 3 
1-5 
1-2 
2-0 
1- 5 
3"5 
0*5? 
0-6 
0-5 
5-0 
2- 5 
51 •••••.• 
Potassium Carbonate . . 
•5 51 • • 
Ammomum Sulphate . . 
55 55 •• 
E. — Experiments carried out in Beakers half filled with 
LIQUID (SOOcbc.) AND COVERED WITH UNSIZED PAPER : DIAMETER 
OF MOUTH OF BEAKER=:ll'5cin. ThE LEAD WAS SUSPENDED IN 
THE LIQUID SO THAT AN AMOUNT OP SURFACE EQUAL TO THAT 
IMMERSED WAS EXPOSED TO THE AIR. 
Calcium Chloride .... 
55 55 •••• 
Potassium Carbonate.. 
5 5 5 5 • • 
Ammonium Sulphate.. 
5) 55 
0-20 
0-20 
0-20 
55 
25 
60 
25 
50 
25 
50 
1- 4 
2- 1 
traces 
0- 5 
0-8 
1- 0 
2- 5 
3- 5 
0-2 
0- 7 
1- 5 
2- 0 
3-5 
40 
0-3 
0-7 
2- 5 
3- 5 
These results do not point to a regular increase of lead 
dissolved associated with increase of surface exposed. In 
certain cases the amount of lead dissolved does increase 
most notably as the surface exposed is increased, but in 
other cases it diminishes. The other conditions affecting the 
solvent action appear to exercise a disturbing influence upon 
that one condition the action of which it was desired to trace. 
Thus in the case of distilled water, whether the surface of 
lead exposed measured 25 or 50 sq. cm. when the action was 
allowed to proceed for 42 hours, the amount of lead dissolved 
was the same, nor did carrying out the experiment in a 
corked flask, a beaker, or a basin loosely covered with porous 
paper, materially affect the result. But when the action had 
proceeded for 340 hours, the conclusions to be drawn are 
found to be very considerably affected by the nature of the 
vessel employed. In closed flasks the amount of lead dis- 
solved slightly decreased with increase of surface exposed ; 
in beakers there was a very marked increase in lead dis- 
solved with increase of surface exposed, while in basins again 
increase of surface was associated with decrease of solvent 
