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the fulfillment of predictions is where truths
ascertained subsequently to the provisional adoption
of the hypothesis or, at least, not at all
seen to have any bearing upon it, lead to new
predictions being based upon the hypothesis of
an entirely different kind from those originally
contemplated and these new predictions are
equally found to be verified.

Thus Maxwell, noticing that the velocity
of light had the same value as a certain fundamental constant
relating to electricity, was led to the
hypothesis that light was an electromagnetic
oscillation. This explained the magnetic
rotation of the plane of polarization, and predicted
the Hertzian waves. Not only that, but it further