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Relation of Growth and Development to Temperature Regulation in Nestling Vesper Sparrows
William R. Dawson and Francis C. Evans

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The Middle American Populations of the Crested Flycatcher Myiarchus Tyrannulus
Wesley E. Lanyon

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Life History of the Cactus Wren, Part Iii: the Nesting Cycle
Anders H. Anderson and Anne Anderson

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The Whistling Swan in the West with Particular Reference to Great Salt Lake Valley, Utah
Glen A. Sherwood

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Agonistic Behavior in the House Finch, Part Ii: Factors in Aggressiveness and Sociality
William L. Thompson

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Notes and News
The Condor

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Back Matter (PDF)
The Condor

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Front Matter (PDF)
The Condor

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Speed of the Allen Hummingbird While Diving
Oliver P. Pearson

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Thyroid Activity in Nestling Vesper Sparrows
William R. Dawson and John M. Allen

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Insects Available for a Mockingbird Wing-flashing in February
Jack P. Hailman

Black Rail in San Joaquin Valley of California
John R. Arnold

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Additional Data on the Establishment of the Chestnut-backed Chickadee at Berkeley, California
Keith L. Dixon

Notes on Winter and Early Spring Bird Activity on the Farallon Islands, California
Asa C. Thoresen

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Confirmation of Occurrence of the American Redstart in Coastal Santa Barbara County, California
Charles H. Richardson and Alice I. Richardson

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Recent Records of the Little Owl and Water Rail in Korea
Chester M. Fennell

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Notes on the Behavior of the Xantus Hummingbird
Ira L. Wiggins

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Records of Lewis Woodpecker for Humboldt County, California
Charles F. Yocom

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Immature Wood Duck, a Photograph
John L. Blackford