The various circumstances connected. With the progress of discovery in electricity, are too interesting and instructive to be omitted, and yet to interweave them with the body of the work, would have rendered it necessary to adopt an order and method, not the most eligible for the purposes of instruction in the existing state of our knowledge. I have, therefore, separated from the rest of the work the narrative of the progressive discovery of electrical science, and consigned it to the introduction.
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