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Excerpt from Light Visible and Invisible: A Series of Lectures Delivered at the Royal Institution of Great Britain, at Christmas, 1896
Two things are expected of a lecturer who undertake a course of Christmas lectures at the Royal Institution. In the first place his discourses must be illustrated to the utmost extent by experiments. In the second, however simple the language in which scientific facts and principles are described, every discourse must sound at least some note of modernity, must reflect some wave of recent progress in science.
So in undertaking a course of lectures in Optics the lecturer in the present instance ventured to proceed on certain lines which may, perhaps, seem strange to the sedate student whose knowledge of optics has been acquired on the narrower basis of the orthodox textbook.
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