Lost plates for treatises on teeth, hearing and the kidneys, rediscovered: In the 1560’s, Eustachi, a professor of medicine in the Collegia della Sapienza in Rome, wrote several treatises devoted to particular organs of the body, including a pioneering work on the teeth. A work on the kidneys also described the adrenal glands. A work on hearing included a description of what we now call the Eustachian tubes. A work on the venous system considered the azygos vein and what we now sometimes call the Eustachian valve in the right ventricle of the heart. Fine etchings were prepared for the collected edition of these essays in 1564, but only 8 were published at that time. More than a century later, the plates were found by a successor to Eustachi, Giovanni Maria Lancisi, the physician of Pope Clement XI, who printed them in this volume.