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PLATE I. —Four species of American orioles: 1, Nelson's oriole, Icterus nelsoni; 2, orchard oriole, I. spurius; 3, Baltimore oriole, I. galbula; 4, Bullock's oriole, I. bullocki. (From specimens)

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AN ELEMENTARY DISCUSSION OF

FACTS, PROCESSES, LAWS AND THEORIES RELATING
TO THE LIFE AND EVOLUTION OF ANIMALS

BY

DAVID STARR ;IORDAN

PRESIDENT OF LELAND STANFORD JUNIOR UNIVERSITY

AND

VERNON LYMAN KELLOGG

PROFESSOR OF ENTOMOLOGY, AND LECTURER IN BIONOMICS
IN LELAND STANFORD JUNIOR UNIVERSITY

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