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CORRELATION OF THE PHYSICAL FORCES.
stops. Here is a better instance to enable some of you to see the certainty with which we can convey this force, where, under ordinary circumstances, chemical affinity would not act. We may absolutely take these two charcoal poles down under water, and get our electric light there;—there they are in the water, and you observe when I bring them into connection we have the same light as we had in that glass vessel.
Now, besides this production of light we have all the other effects and powers of burning zinc. I have a few wires here which are not combustible, and I am going to take one of them, a small platinum wire, and suspend it between
Fig. 48.
these two rods which are connected with the battery, and when contact is made at the bat-
