- 1Note on the Illustrations
- 2Introductory and Explanatory
- 3I — Fossils, and How They Are Formed
- 4II — The Earliest Known Vertebrates
- 5III — Impressions of the Past
- 6IV — Rulers of the Ancient Seas
- 7V — Birds of Old
- 8VI — The Dinosaurs
- 9VII — Reading the Riddles of the Rocks
- 10VIII — Feathered Giants
- 11IX — The Ancestry of the Horse
- 12X — The Mammoth
- 13XI — The Mastodon
- 14XII — Why Do Animals Become Extinct?
Animals of the Past
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