CONTENTS.—1st. Biographical memoir of Henry Larcom Abbot, 1831-1927 [with bibliography]; by Charles Greeley Abbot.—2d. Biographical memoir of Henry Andrews Bumstead, 1870-1920 [with bibliography]; by Leigh Page.—3d. Biographical memoir of Edward Drinker Cope, 1840-97, by Henry Fairfield Osborn; [with Bibliography of Edward Drinker Cope, 1859-1915], by Henry Fairfield Osborn and assistants.—4th. Biographical memoir of Jacques Loeb, 1859-1924, by W. J. V. Osterhout; [with Jacques Loeb, bibliography, compiled by Nina Kobelt].