1931. THE RIDDLE OF MIGRATION. 151 pp., illus. Baltimore.

(43) Watson, J. B., and Lashley, K. S.

1915. AN HISTORICAL AND EXPERIMENTAL STUDY OF HOMING. Carnegie Inst. Washington, Dept. Marine Biol. Papers 7: 1-60, illus.

(44) Wetmore, A.

1923. MIGRATION RECORDS FROM WILD DUCKS AND OTHER BIRDS BANDED IN THE SALT LAKE VALLEY, UTAH. U. S. Dept. Agr. Bull. 1145, 16 pp., illus.

(45) ——————

1926. THE MIGRATIONS OF BIRDS. 217 pp., illus. Cambridge, Mass.

(46) Winkenwerder, H. A.

1902. THE MIGRATION OF BIRDS WITH SPECIAL REFERENCE TO NOCTURNAL FLIGHT. Wis. Nat. Hist. Soc. (n. s.) 2: [177]-263, illus.

INDEX