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ELECTRICITY.
concerned in this case, quite different to anything we have met with before; but the force is the same. We have here then a double attraction—a dual attraction or force—one attracting and the other repelling.
Again, to show you another experiment which will help to make this clear to you. Suppose I set up this rough indicator again [the excited shellac suspended in the stirrup]; it is rough, but delicate enough for my purpose; and suppose I take this other piece of shellac, and take away the power, which I can do by drawing it gently through the hand;
Fig. 34.
and suppose I take a piece of flannel (fig. 34) which
