WARREN, John Collins (1778-1856). Surgical Observations on Tumours, with Cases and Operations. Boston: Crocker and Brewster, 1837. 8o. 16 hand-colored plates. Modern quarter calf preserving contemporary boards. Provenance: Edinburgh, Medical Society (inkstamp on title and verso of plates). FIRST EDITION of the first North American book on tumors. Garrison-Morton 2611.1; Osler 4189; Waller 10122. -- Effects of Chloroform and of Strong Chloric ether, as Narcotic Agents. Noston: William D. Ticknor, 1849. 8o. Folding table. Original limp decorated cloth. FIRST EDITION. Blocker p. 413; Cushing W52; Osler 1491. (2)