MITCHELL, John Kearsley (1793-1858). On the Cryptogamous Origin of Malarious and Epidemic Fevers, Philadelphia: Lea and Blanchard, 1849, 12° in 6's, FIRST EDITION, PRESENTATION COPY, inscribed on verso of front blank: "For Caspar Morris M.D. with the regards of the author" (tear to lower margin of title, light spotting), original black ribbed cloth, covers decorated in blind, front cover titled in gilt (discrete library markings on front cover and spine, head of spine a little frayed) [GM: "Although Hensinger in 1844 had suggested a parasite as the cause of malaria, Mitchell was the first to approach this theory in a scientific spirit"; Norman 1518; Waller 6566] Provenance: JCL