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In the olden times, instead of writing a preface, the author wrote an " apology " for having written a book at all. One should now-a days be very sure that there is need, when he undertakes to write a new book. Our author finds the need of a new book on the subject of which he treats, in the fact that photographic illustrations of actual appearances are needed to fill an existing gap in the domain of morbid histology; and the fact must be admitted that our monographs and text-books are filled with illustrations which are rather diagrammatic, than representative of an actual specimen. There is sufficient reason why this should be the case, and that is a pecuniary one. It has been pretty well demonstrated that, in the existing condition of the art of lithography and engraving, we cannot reproduce on ordinary paper, either faithful photographs or well worked out
Practical Pathology and Morbid Histology.. JAMA. 1891;XVII(3):123. doi:10.1001/jama.1891.02410810039012