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G25

nature of light. The first false conjecture was that the rays
started from the eye; the second was right in making them vibrations,
but Newton rejected it in favor of the emission theory of which, I
believe there were three forms. Sixthly Counting those as five erroneous
theories, there next came two theories of transverse vibrations in
an ether, and though one of them was hardly wrong, they
ultimately gave way to the electromagnetic theory which may be
reckoned as the eighth and right one. Of two secrets of physics
it may be said that the very first definite theories were right.

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