SCHEINER, Christoph.

Oculus hoc est: Fundamentum Opticum, in quo ex accurata Oculi Anatome, abstrusarum experientiarum sedula pervestigatione, ex invisis specierum visibilium tam everso quam erecto situ spectaculis, necnon soldidis rationum momentis Radius Visualis ervitur; sua Visioni in Oculo sedes decernitur; Anguli Visorii ingenium aperitur...

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Finely engraved allegorical frontis. & numerous woodcut diagrams in the text. 7 p.l. (incl. frontis.), 254 pp. 4to, cont. limp vellum over boards (first & last few leaves with faint dampstaining), ties gone. Innsbruck: D. Agricola, 1619. First edition, and a fine copy, of one of the most famous and important works in the history of optics. In this book, Scheiner demonstrated for the first time that the retina is the actual organ of sight and explained the pupil changes known as “accommodation.” He also devised the pin-hole test (“Scheiner’s test”) to illustrate accommodation and refraction. “The intricate frontispiece depicts a ‘camera obscura’ and a system of inverting lenses, as well as the newly-invented telescope. The peacock in the foreground carries a double meaning, representing not only the science of optics, but the overly prideful Galileo.”–Linda Hall Library, Jesuit Science in the Age of Galileo, 9. A fresh copy. Early signature on title of “P.D. Huet.” This is most certainly the famous French scholar and scientist Pierre Daniel Huet (1630-1721), who, being short-sighted, devoted his anatomical studies to the question of vision and the formation of the eye. He made more than 800 dissections (see Encycl. Brit.). ❧ D.S.B., XII, pp. 151-52. Garrison-Morton 1480.

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