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Preface; 1. The climate and physical aspects of the equatorial zone; 2. Equatorial vegetation; 3. Animal life in the tropical forests; 4. Humming-birds: as illustrating the luxuriance of tropical nature; 5. The colours of animals and sexual selection; 6. The colours of plants and the origin of the colour-sense; 7. By-paths in the domain of biology; 8. The distribution of animals as indicating geographical changes; Index.