THE MIGRATION OF NORTH AMERICAN BIRDS 67 
(19) Cooks, W. W. 
1915. 
THE YELLOW-BILLED LOON: A PROBLEM IN MIGRATION. Condor 
17: 213-214. 
(20) Cours, E. 
(21) 
(22) 
(23) 
(24) 
(25) 
(38) 
(39) 
1878. 
GATKE, 
1895. 
BIRDS OF THE COLORADO VALLEY, A REPOSITORY OF SCIENTIFIC 
AND POPULAR INFORMATION CONCERNING NORTH AMERICAN 
ORNITHOLOGY. U.S. Dept. Int. Mise. Pub. 11, 807 pp., illus. 
H. 
HELIGOLAND AS AN ORNITHOLOGICAL OBSERVATORY, THE RESULTS 
OF FIFTY YEARS’ EXPERIENCE. (Transl. from the German by 
R. Rosenstock.) 599 pp., illus. Edinburgh. 
GRINNELL, J. 
1931. SOME ANGLES IN THE PROBLEM OF BIRD MIGRATION. Auk 48: 
22-32. 
Gross, A. O. 
1927. THE SNOWY OWL MIGRATION OF 1926-27. Auk 44: 479-498, illus. 
Harrison, T. H. 
1931. 
ON THE NORMAL FLIGHT SPEEDS OF BIRDS. Brit. Birds 25: 86—96. 
LINcOLN, F. C 
1917. 
1922. 
1924. 
1924. 
1926. 
1927. 
1927. 
1928. 
1934. 
MAGEE, 
1928. 
MAY. J< 
1929. 
BOHEMIAN WAXWING (BOMBYCILLA GARRULA) IN COLORADO. Auk 
34: 341. 
TRAPPING DUCKS FOR BANDING PURPOSES: WITH AN ACCOUNT OF THE 
RESULTS OBTAINED FROM ONE WATERFOWL STATION. Auk 39: 
322-334, illus. 
BANDING NOTES ON THE MIGRATION OF THE PINTAIL. Condor 26: 
88-90. 
RETURNS FROM BANDED BIRDS, 1920 TO 1923. U.S. Dept. Agr. Bull. 
1268, 56 pp., illus. 
THE MIGRATION OF THE CACKLING GOOSE. Condor 28: 153-157, 
illus. 
NOTES ON THE MIGRATION OF YOUNG COMMON TERNS. North 
eastern Bird Banding Assoc. Bull. 3: 23-28, illus. 
RETURNS FROM BANDED BIRDS, 1923 TO 1926. U.S. Dept. Agr. Tech. 
Bull. 32, 95 pp., illus. 
THE MIGRATION OF YOUNG NORTH AMERICAN HERRING GULLS. Auk 
45: 49-59. 
THE WATERFOWL FLYWAYS OF NORTH AMERICA. U.S. Dept. Agr. 
Cire. 342, 12 pp., illus. 
M. J. 
EVENING GROSBEAK RECOVERIES. Northeastern Bird Banding 
ee eee: Bull. 4: 56-59. 
RECOVERIES OF BLACK-CROWNED NIGHT HERONS BANDED IN MASSA- 
cHUSETTs. Northeastern Bird Banding Assoc. Bull. 5: 7—16, 
illus. 
PauMEn, J. A. 
1893. 
REPORT ON THE MIGRATION OF BIRDS. Transl. from the German by 
C. W. Shoemaker. Smithsn. Inst. Ann. Rept. 1892: 375-396, 
illus. 
Puiuurrs, J. C., and Lincoin, F. C. 
1930. 
Rowan, 
1925. 
1926. 
AMERICAN WATERFOWL: THEIR PRESENT SITUATION AND THE OUT- 
LOOK FOR THEIR FUTURE. 312 pp., illus. Boston and New York. 
W. 
RELATION OF LIGHT TO BIRD MIGRATION AND DEVELOPMENTAL 
CHANGES. Nature [London] 115: 494—495. 
ON PHOTOPERIODISM, REPRODUCTIVE PERIODICITY, AND THE ANNUAL 
MIGRATIONS OF BIRDS AND CERTAIN FISHES. Boston Soc. Nat. 
Hist. Proe. 38: [147]-189. 
