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A treatise of the small-pox and measles; describing their nature, causes, and signs, diagnostick and prognostick, in a different way to what hath hitherto been known. Together, with the method of curing the said distempers, and all, or most, of the best remedies. Also a particular discourse of opium, diacodium, and other sleeping medicines. With a reference to a very great case / By Gideon Harvey. Public Domain Mark. Source: Wellcome Collection.