IN DIFFERENT SALINE FLUIDS BY THE AID OF ELECTRICITY. 
209 
The result of these experiments with oxalate of lime may be thus arranged : — 
Average temp. Pairs of Grs. dissolved. 
h 
m 
plates. 
Exp. 
1 lasted 7 
10, in solution ^ nitre, f water . . . 
90° 
5 
1 
2 
Exp. 
2 lasted 7 
10, in solution ^ nitre, f water . . . 
104 
10 
2 
Exp. 
3 lasted 6 
15, in sulphate of soda 
101 
10 
2 
Exp. 
4 lasted 5 
45, in common salt 
102 
10 
1 
Exp. 
5 lasted 6 
1 0, in nitre water f 
108 
20 
6 
Exp. 
6 lasted 3 
19, in nitre ^ with phosphate of soda . 
no 
20 
1 
Exp. 
7 lasted 3 
15, in nitre ^ with bichrom. of potassa 
111 
20 
2 
Exp. 
8 lasted 3 
17, in nitre water f 
110 
20 
oi 
^2 
Exp. 
9 lasted 2 
50, in nitre water f 
92 
20 
Oi 
^2 
Exp. lO lasted 3, 
in nitre water f 
100 
40 
5 
Henee oxalate of lime calculi can be only very slowly dissolved in the solution of 
nitrate of potassa, which acts most energetically on uric acid calculi. The solution of 
the oxalate of lime is from ^ a grain to 2 grains nearly an hour, so that the action is 
certainly four times as slow as in the case of uric acid calculi. 
Such being the result when the calculus consisted of oxalate of lime only, it ap- 
peared desirable to determine what would be the elFeet when the calculus consisted 
of oxalate of lime with uric acid, or of oxalate of lime with the earthy phosphates. 
Experiment 11. — Half an oxalate of lime calculus, which contained uric acid also 
on the external surface, weighed 258 grains. The solution of nitre, consisting of one- 
fourth nitre and three-fourths distilled water, with twenty pairs of plates, was employed. 
The action began at O'* 35“ a.m. and was continued to 1 p.m. ; the temperature of the 
solution was between 64° and 120°. 
Total time S*" 25“. 
When dry the calculus weighed 254 grains, so that in three hours twenty-five 
minutes the loss was 4 grains. There was very little aetion on the calculus at the 
positive or acid electrode. The negative electrode was in contact with the external 
surface, and there the action had taken place. 
Experiment 12. — The experiment with the same stone was repeated with the same 
solution and the same strength of battery. The solution was changed thirty-three 
times; the temperature was 110°; the time of action was three hours twenty-three 
minutes, in which the calculus lost 5 grains. There was very little action at the 
positive electrode, but very distinct at the negative eleetrode, which was on the 
upper and external surface. 
Experiment 13. — Another small half calculus, consistingof oxalate of limeand uric 
acid, weighing 64 grains, was submitted to the action of twenty pairs of plates, whilst 
in a continuous stream of nitre of the same strength as before. 
The action began at 9'' 32“a.m., the temperature throughout was from 90° to 98°, 
and was stopped at 12'* 48“a.m. 
The total time 3** 16“. 
