Mr. Kemp’s Experiments on Galvanism. 93 
lines in the figure. These portions of the wire retained the states 
of the poles of the battery A B, whatever state might be induced 
upon the bent parts of it by the battery C D. This was shown by 
the liquid in the limb L of the siphon becoming green, and in that 
of M becoming red. | 
When the battery C D had its poles reversed, a corresponding 
change took place upon the states of the bent portion of the wire 
I K, immersed in the siphons E F and GH, while its extremities, 
which terminated in the siphon LM, retained their original states 
of the poles of the battery A B. : 
4. The following Experiment shows that the wires coming from 
the poles of the galvanic battery, may have induced upon both 
of them, either the positive or negative state, by combining mith 
them the electricity of other batteries. 
THE batteries A B and CD (Plate III. Fig. 3.) were charged, 
and the wires coming from their poles terminated in the two lateral 
siphons, EF and GH, which were filled with the solution used_in 
the last experiment, and. arranged in exactly the same manner. In 
place of the middle siphon there was substituted a siphon-like tube, 
composed of three limbs, ORQ, also filled with the vegetable solu- 
tion. The extremities of the wires, I and K, coming from the poles 
of the battery A B, were now placed into the two lateral limbs, O 
and Q, of the siphon. Thus far the experiment was exactly the 
same as the former: the wires I and K, from the battery A i, re- 
tained the same electric states as its poles, notwithstanding that the 
electricity of the battery CD, circulated along the wire at the 
same time. 
Another battery S was then filled, and a wire T, from N its ne- 
gative pole, made to communicate with the positive pole of the 
battery AB. Another wire, represented by a dotted line, was 
then brought from its positive pole, and its extremity terminated 
in the central tube B of the siphon-shaped vessel. 
The wires I and K both gave negative electricity, as the liquid 
with which they were connected in the tubes O and Q, was changed 
into green, while that in the tube R assumed a red colour. 
In this arrangement, the negative electricities of the batteries S 
and CD, passes along the wire K, together with the positive elec- 
tricity of the battery AB. Apparently, the two negative electri- 
cities exert a stronger influence on the wire than the positive elee- 
tricity does, and consequently it changes the solution of the salt 
into a green colour ; the wire I being in the same electric state as 
the pole of the battery with which it is connected, namely negative, 
also changes the solution in the other limb of the vessel into green. 
‘The other wire, which is inserted into the middle tube of the si- 
phon vessel, being in connection only with the positive pole of the 
battery S, gives positive electricity, changing the liquid in the tube 
-to.a red colour. . | : 
