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An essay on the small-pox: with regard 1st, to its specifick cause, 2dly, to its true nature and essence, 3dly, to the best methods of curing it. To which is subjoin'd, seasonable reflections and considerations on the modern practice of inoculation. In which the two grand objections to the most rational and salutary institution, are examined and refuted / by Charles Perry. Public Domain Mark. Source: Wellcome Collection.