[MONSTROSITIES]. Group of 6 antiquarian tracts on medical oddities. Including: POSNER, Caspar. Curioser Tractar von den Miss-Geburthen. Dresden and Leipzig: Johann Christoph Mieth, 1702. ? WALDSCHMIDT, Johann Jacob. Disputatio Physica de Causa Partus Monstrosi. Marburg: Joh. Jodoci Kursner, 1784. ? EVERS, August. Kurze Geschichte der Geburt eines Kindes mit Zwey Ko?pfen. Schwerin: Wilhelm Barensprung, 1793. ? KLEIN, Carolus Christian. Specimen inaugurale anatomicum sistens monstrorum quorundam descriptionem. Stuttgart: Typis Academicis, 1793. Two folding plates. ? and two others, one with an engraved plate and text engraving. Various sizes, small 4to and 8vo. All similarly bound in plain wrappers with inked titles ?Monsters? followed by a Roman numeral (apparently drawn from a series numbering at least over 300 tracts).