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iv OPTICAL PROJECTION work treating Physical Optics from this point of view, ample evidence has been furnished that others have felt strongly the same fascination as myself in this class of experiments. The preparation of the following pages, as a treatise upon the more general use and manipulation of the Lantern through its entire range, in a manner that may suggest proper arrangements even where want of space or my own lack of detailed experience may prevent specific treatment, was not spontaneous on my part, but waa suggested to me by Mr. Herbert C. Newton. During years past I have spent very many hours associated with him—many of them actually in his company- engaged in contriving, perfecting, testing, or adjusting scientific optical apparatus; often for myself, but more frequently for the use of others, and especially of colleges and public institutions. He was good enough to suggest on many occasions that a practical treatise from my pen, and embodying the results of my experience, would be of service; in fact he has urged the task upon me with some persistence. Whether or not I have been able to add anything of value to such handbooks as were previously obtainable, must be left to the reader's judg- ment. But that is the real origin of this work; and it is best to state it frankly, because it will naturally account for such description as will be found hereafter of apparatus—microscopic and polariscopic in particular —which was worked out to the best of my ability with a primary view to being constructed by the firm which Mr. Newton represents, from whom I have received