Vetero-Prague, Joannis Josephi Clauser, 1767. 4to (24.0 x 20.4 cm). 31 pp.; six large, folded, engraved plates. Contemporary bind blue wrappers.

A rare, early, well-illustrated treatise on a teratological human foetus, or 'Siamese twin', with one head, and two bodies. The author, Josef Tadeáš Klinkoš - or Thaddäus Klinkosch - (1734-1778) was a Czech anatomist and surgeon who carefully dissected the stillborn infant. This may be the first in-depth study on this subject. The fine plates - showing internal and external anatomy in great detail - are by the Czech painter Jan Jakub Quirin Jahn (1739-1802). "Jahn was the last leader of the Prague guild of painters, before the guild was dissolved as part of reforms of Joseph II." (Wikipedia). Owner's inscription in an old hand on the title page; a few small, isolated spots, otherwise a very good, clean copy. Poggendorff, p. 1275. Not in Morton.