De Aure Humana Tractatus .... - BOUND WITH - Tractatus de Organo Auditus

Leyden: Langerak, 1735/1730. Later Printings.. Contemporary stiff vellum.. Very good. The Valsalva has a tear in the blank margin of the titlepage.. Small 4to, I - [14], [1] - 143, [13 - index] + 10folding copperplate engavings; II - [16], [1] - 76, [4 - publisher's catalog of medical books] + 16 plates (some folding).

These are two different books on the same topic bound together. The Valsalva retains the dedication leaf absent from most copies and the Langerak book catalogue is also present. Both books are classics of otology. The Valsalva provides invaluable information on the smallest muscles and nerves of the ear as well as illustrates a method of inflating the middle ear that is still used today. The Du Verney is the scientific account of the structures and diseases of the ear. He was also first to develop a theory of audition that has been generally credited to Helmholtz. Though issued years apart (and often sold separately) it is safe to assume the Langerak issued a number of copies of this book in this manner. See G-M #1545 & #1546 citing the first editions.