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... that the vibrations thus excited are propagated in the refracting or reflecting medium or substance, much after the manner that vibrations are propagated in the air for causing sound and move faster than the rays so as to overtake them...

Natural Philosophy: With an Explanation of Scientific Terms, and an Index - Page 44
1832
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Nobel Lectures in Physics

1998 - 476 pages

...Air : so the Rays of Light, by impinging on any refracting or reflecting Surface, excite vibrations in the refracting or reflecting Medium or Substance,...Ray is in that part of the vibration which conspires with its Motion, it easily breaks through a refracting Surface, but when it is in the contrary part...

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