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Updated: May 25, 2025
The electro-vital fluid, in the animal economy, is subject to the same principles of polarization as the magnetic current from the artificial machine, or the magnetism of the bar-magnet. In the material organism of man, the great nerve-centers the brain, the spinal cord, and the ganglions appear to act the part of fixed magnets, charged with the electro-vital fluid.
Professor Joseph Henry had, in 1832, constructed an electromagnetic telegraph whose signals were made by sound, as all signals now are in the so-called Morse system. He hung a bar-magnet on a pivot in its center as a compass-needle is hung.
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