144 
Fresh light is also thrown upon the question now under 
consideration by the results of experiments having for their 
special object a comparison of the solvent action of various 
liquids upon different samples of lead. (Par. 10.) 
Table II. 
Lead Immersed in strong solutions of the undermentioned Salts 
FOR THREE MONTHS : THEN WASHED WITH A LITTLE DiSTILLED 
Water, and Immersed in various solutions. 
Experiments carried out in Beakers half-filled with water 
(SOO cB.C. IN each) and covered with unsized paper : DIAMETER 
OF MOUTH OF BEAKERrrll*5c.M. 
A . — Lead immersed in strong solution of Potassium Carbonate. 
Surface 
Grams 
of Lead 
Total Lead, in Mgms., in solution after 
per litre. 
exposed 
Then in 
in sq. cm. 
6 days. 
15 days. 
38 days. 
62 days. 
Potassium Carbonate. . 0’20 . 
. 50 ... 
trace . 
.. trace . 
. trace ... 
trace 
„ Nitrate 0‘20 .. 
. 50 ... 
0-4 . 
. 1-0 . 
. 10 ... 
1-20 
Ammonium „ 0 20 . 
. 50 ... 
1-5 . 
.. 3-5 . 
. 20 ... 
1-00 
B . — Lead immersed in strong solution of Potassium Hitrate. 
Then in 
Potassium Carbonate.. 0-20 . 
. 50 ... 
0-20 . 
.. 0-20 . 
. 0-20 ... 
0-30 
,, Nitrate 0'20 . 
. 50 ... 
0 30 . 
. 0-30 .. 
. 0-20 ... 
0*30 
Ammonium ,, 0'20 .. 
. 50 ... 
0-50 . 
. 0-50 .. 
. 0‘30 ... 
0*70 
C . — Lead immersed, in strong solution of Calcium Chloride. 
Then in 
Potassium Carbonate.. 0'20 .. 
. 50 ... 
0-20 .. 
. 0-20 .. 
. 0-20 ... 
0*50 
„ Nitrate 0’20 .. 
. 50 ... 
1-20 .. 
. 0-50 .. 
. 0-40 ... 
0*50 
Ammonium „ 0'20 .. 
. 50 ... 
2-50 . 
. 0‘80 .. 
. 0-60 ... 
0*80 
D. — Lead immersed in strong solution of Ammonium Suljghate. 
Then in 
Potassium Carbonate.. 0’20 .. 
. 50 ... 
0-30 . 
.. 0-50 . 
. 0-40 ... 
0*50 
„ Nitrate ; 0*20 .. 
. 50 ... 
3 00 . 
. 3 00 .. 
. 1-90 ... 
1*80 
Ammonium „ 0*20 .. 
. 50 ... 
5-00 . 
. 1*30 .. 
. 0-30 ... 
1*00 
4. In order to compare these numbers with those ob- 
tained by submitting the same amount of surface of the 
same specimen of lead to the action of distilled water con- 
taining equal quantities of the same salts during the same 
intervals of time, I subjoin the following determinations 
taken from a paper already read before this Society, 
(xvi., p. 3.) The experiments were carried out under exactly 
similar conditions, 
