12 CIRCULAR 428, U. S. DEPARTMENT OP AGRICULTURE 



(52) Phillips, J. C. 



1922. A NATURAL HISTORY OF THE DUCKS. 4 V., illuS. Boston. 



(53) — — 



1930. the flight speed of birds. Sportsman 8 (5): 59, 86, illus. 



(54) Pitt, F. 



1933. HOW FAST DO BIRDS FLY? SOME EXPERIMENTS IN TIMING BY TRAIN 



and by car. Field [London] 162: 829. 



(55) Portal, C. F. A. 



1922. the speed of birds. [Letter to editor] Field [London] 139: 233-334. 



(56) Portal, C. F. H. 



1917. the height at which birds fly. [Letter to editor.] Field 

 [London] 129: 387. 



(57) Pycraft, W. P. 



1922. birds in flight. 133 pp., illus. London. 



(58) R., E. P. 



1913. how fast do ducks fly? Forest and Stream 80: 41. 



(59) Radclyffe, C. E. 



1922. the speed of birds. [Letter to editor.] Field [London] 139: 234 



( 60 ) 



1933. how fast do birds fly? Field [London] 162: 1216. 



(61) Rathbun, S. F. 



1934. notes on the speed of birds in flight. Murrelet 15: 23-24. 



(62) Ritter, C. B. 



1910. speed of birds and animals. Amer. Field 73: 200. 



(63) Roberts, B. B. 



1932. on the normal flight-speed of birds. Brit. Birds 25: 220-222. 



(64) Scott, W. E. D. 



1881. SOME OBSERVATIONS ON THE MIGRATIONS OF BIRDS. Bull. Nuttall 



Ornithol. Club 6: 97-100. 



(65) Sheldon, H. H. 



1922. top speed of the road-runner. Condor 24: 180. 



(66) Smith, C. R. 



1924. SPEED OF THE BROWN PELICAN. Gull 6 (9): [3]. 



(67) • 



1924. SPEED OF THE ROAD RUNNER. Gull 6 (9): [3], 



(68) Stoddard, H. L. 



1931. the bob-white quail. 559 pp., illus. New York. 



(69) Thienemann, J. 



1912. untersuchungen uber die schnelligkeit des vogelfluges. 

 Jour. Ornithol. 58: 644-669. 



(70) Ticehurst, N. F. 



1922. velocity of flight among birds. [Comment.] Brit. Birds 

 16: 31. 



(71) Tyler, J. G. 



1933. items from an oologist's notebook. Condor 35: 186-188. 



(72) Very, F. W. 



1897. observations of the passage of migratory birds across the 

 lunar disk on the nights of september 23 and 24, 189b. 

 Science (n. s.) 6: 409-411. 



(73) Walker, A. 



1903. the speed of birds. Field [London] 101: 534. 



(74) Wallis, H. M. 



1922. the velocity of flight of birds. [Letter to the editors.] Brit. 

 Birds 16: 140. 



(75) Warner, L. H. 



1931. facts and theories of bird flight. Quar. Rev. Biol. 6: 84-98, 

 illus. 



(76) Weiser, C. S. 



1933. flying with a flock of swans. Auk 50: 92-93. 



(77) Wetmore, A. 



1916. the speed of flight of certain birds. Condor 18: 112-113. 



(78) White, F. B. 



1927. birds and motor cars. Auk 44: 265-266, 1927; 46: 399, 1929; 

 50: 236, 1935. 



(79) Wicks, R. W. 



1931. THE SPEED OF GAME BIRDS; TESTING THEIR FLIGHT BY AEROPLANE. 



Field [London] 157: 283. 



(80) 



1934. the speed of teal in flight Field [London] 163: 229. 



