_Has Magnetism any concern in the Phenomena discovered by Galvani?_
In answer to this question I have little to say, as the experiments
which it suggested, and which I had an opportunity of making, have been
but few.
I have repeatedly excited contractions, both with the natural and the
artificial loadstone, but I could never observe any difference between
them, and such as were excited by unmagnetised iron, or an ore
containing an equal quantity of iron with the natural loadstone.
When the separated leg of a frog was laid upon a plate of iron, and a
loadstone was brought in contact both with its nerve and the plate, no
contraction was excited. I have often brought frogs, in every state of
preparation, as nearly as possible to a very sensible magnetic needle,
but no variation in its direction was in any case produced by the
contractions of the frogs excited by the metals.
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