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 JORDAN
PRESIDENT OF LELAND STANFORD JUNIOR UNIVERSITY
AND
VERNON LYMAN KELLOGG
PROFESSOR OF ENTOMOLOGY, AND LECTURER IN BIONOMICS IN LELAND STANFORD JUNIOR UNIVERSITY