Contents
A Study of the Northern Raven
W. Bryant Tyrrell
Incubation and Nestling Periods of Central American Birds
Alexander F. Skutch
The Pteryloses of Some Australian Birds
Hubert Lyman Clark
The Effect of Auditory Stimulation on the Spermatogenetic Cycle of the Male English Sparrow
C. S. Thornton and S. B. Cummings Jr.
The European Starling in Gasp
Stanley C. Ball
Do Birds Cross the Gulf of Mexico in Spring?
George G. Williams
Notes on Panamanian Birds
John W. Aldrich
Notes on Pearl Islands Ornithology
Robert Cushman Murphy
Sex Ratios of Ducks in Southwestern Washington
James R. Beer
Recent Literature
The Auk
Notes and News
The Auk
Corrigenda
The Auk
Obituaries
The Auk
General Notes
Flight Speed of the Old-squaw
J. Murray Speirs
Prating for Passenger Pigeons
Francis H. Allen
An Unusual Feeding Habit of the Black Vulture
E. A. Mcilhenny
A Change of Breeding Season by Australian Gulls
Malcolm Davis
Catesby's Tropic-bird
W. L. Mcatee
The Type of Telespiza Ultima Bryan
G. Willett
Unusual Pigeonries" of the Domestic Pigeon"
Ralph B. Williams
Aircraft Collision with a Goldfinch
Capt. V. H. Brown
Aortic Rupture in Field Sparrow Due to Fright
Lawrence H. Walkinshaw
The Robin Does Not Change Its Tail Spots
Harold B. Wood
Extraordinary Fatality to a Blue-winged Teal
Major Clifford H. Pangburn
The Woodcock at San Antonio, Texas
Major Clifford H. Pangburn
The Molt of the Emperor Penguin
Malcolm Davis
Louisiana Heron in Virginia in December
Heathcote Kimball
A Chimney Swift from Colombia
John T. Zimmer
Yellow-green Vireo Nesting in Cameron County, Texas
L. Irby Davis
Brasher's Warbler in Texas
L. Irby Davis
The Phainopepla near San Antonio, Texas
Major Clifford H. Pangburn and Sergeant Joseph M. Heiser Jr.
Arkansas Kingbird in Alabama
Lt. Gerald Rogers
Leach's Petrel in Florida
R. J. Longstreet
Red-eyed Vireo's Incubation
Hervey Brackbill
A Raven's Nest near Lexington, Virginia
J. J. Murray
Wherein Lies the Economic Value of Birds?
W. L. Mcatee
Vesper Sparrows Mated Two Successive Summers
Lawrence H. Walkinshaw
Sitka Crossbills in Massachusetts
W. Earl Godfrey
Correspondence
The Bronzed Grackle as a Species
George Miksch Sutton
Covers
Front Matter
The Auk
Back Matter
The Auk