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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from Faraday as a Discoverer by John Tyndall: maintained the non-polarity of the diamagnetic force.
He then entered a new, though related field of inquiry. Having
dealt with the metals and their compounds, and having classified all
of them that came within the range of his observation under the two
heads magnetic and diamagnetic, he began the investigation of the
phenomena presented by crystals when subjected to magnetic power.
This action of crystals had been in part theoretically predicted by
Poisson,[2] and actually discovered by Plucker, whose beautiful
results, at the period which we have now reached, profoundly
interested all scientific men. Faraday had been frequently puzzled
by the deportment of bismuth, a highly crystalline metal. Sometimes
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