CUREAU DE LA CHAMBRE, Marin (1593-1669). Nouvelles observations et coniectures sur l'iris. Paris: Pierre Rocolet, 1650. 4o (239 x 178 mm). Engraved text illustrations (small dampstain to title and first few leaves, small repairs to first blank). Contemporary mottled calf, gilt-panelled (spine skilfully renewed preserving red morocco lettering piece, boards slightly dried, minor scrapes). Provenance: unsigned gift inscription dated 1 January 1894 on front free endpaper; Alain Brieux (bookplate on front pastedown). FIRST EDITION. The author was physician to Louis XIII and Louis XIV, and one of the 15 original members of the Paris Academie de Science. The present work relates to the nature of colors originating from refraction. NLM/Krivatsy 3017.