A Masterpiece of Optical Science: Cherubin d'Orleans' La Dioptrique Oculaire (1671)

The Visionary Work of Cherubin d'Orleans

La Dioptrique Oculaire stands as one of the most significant optical treatises of the seventeenth century, authored by the brilliant French scholar and Capuchin friar Cherubin d'Orleans. Published in 1671, this monumental folio represents a crucial contribution to the science of optics and vision during an era when understanding light and sight captivated Europe's greatest scientific minds.

Cherubin d'Orleans devoted his life to the study of optical phenomena, building upon the foundational work of previous scholars while pushing the boundaries of optical theory. His comprehensive examination of dioptrics—the behavior of light as it passes through transparent media—made him one of the most respected optical theorists of his time. La Dioptrique Oculaire synthesized centuries of optical knowledge while presenting innovative observations about human vision and the nature of light.

A Work of Exceptional Physical Beauty

Beyond its scholarly importance, this 1671 edition exemplifies the heights of French book arts during the reign of Louis XIV. The volume measures an impressive folio format (367 x 240 mm), containing 57 exquisitely engraved plates, including six remarkable fold-out illustrations that would have astounded contemporary readers with their technical complexity. The engraved title page was created by the renowned G. Eddelinck after designs by Le Pautre, two of the most celebrated engravers of the period.

The dedication features a magnificent engraved header incorporating the coat of arms of Jean-Baptiste Colbert, Louis XIV's powerful minister of finance and patron of the arts. This prominent dedication signals the book's importance within the French scientific establishment and Colbert's role in supporting intellectual advancement.

Why This Edition Remains Extraordinarily Rare

Several factors elevate this particular copy to exceptional status among collectors. The binding—original spattered vellum with six raised bands richly gilt in the compartments and a red morocco label with gilt letters—represents museum-quality craftsmanship. The gilt board edges and red-dyed fore-edges further enhance its desirability. The condition, while reflecting three centuries of careful handling, remains excellent with wide margins and complete text and plates.

The volume's provenance adds scholarly weight: it comes from the distinguished Biblioteca Caproni Vizzola and subsequently the Biblioteca Giancarlo Beltrame, both renowned Italian collections. Such impeccable provenance assures collectors of authenticity and historical significance.

The colophon indicates printing by Jean Cusson in 1670, adding another layer of bibliographic interest for specialists of French printing history. Surviving copies in such distinguished condition, with unmarred engravings and contemporary annotations, appear remarkably seldom on the market.

A Treasure for Discerning Collectors

For collectors of rare scientific books, early optical treatises, and fine French printing, this copy of La Dioptrique Oculaire represents an extraordinary acquisition opportunity. It combines historical significance, artistic beauty, and exceptional condition—the triumvirate that defines truly important rare books. This is a work worthy of the most distinguished libraries.