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380 FRAGMENTS OF SCIENCE.

being the case proves that these molecular currents are not the mechan-
ism by which diamagnetic induction is effected. The consciousness of
this, I doubt not, drove M. Weber to the assumption that the phenomena
of diamagnetism are produced by molecular currents, not directed, but
actually excited in the bismuth by the magnet. Such induced currents
would, according to known laws, have a direction opposed to those of the
inducing magnet, and hence would produce the phenomena of repulsion.
To carry out the assumption here made, M. Weber is obliged to suppose
that the molecules of diamagnetic bodies are surrounded by channels, in
which the induced molecular currents, once excited, continue'to flow
without resistance.”—Diamagnetism and Magne-crystallic Action, pp. 136,
137.

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