- Young Hoactzins
- Where a Dinosaur Sat Down
- Triceratops - A Huge Extinct Reptile
- Tooth of Mastodon and of Mammoth
- Time-chart 6000 B.C. to A.D.
- Thespesius, a Common Herbivorous Dinosaur of the Cretaceous
- The walking-fish or mud-skipper (Periophthalmus)
- The Track of a Three-toed Dinosaur
- The Three Giants, Phororhacos, Moa, Ostrich
- The Sub-Man Pithecanthropus
- The Skull and Brain-Case of Pithecanthropus
- The oldest fossil fish known—discovered in the Upper Silurian strata of Scotland, and named Birkenia by Professor Traquair
- The Missourium of Koch, from a Tracing of the Figure Illustrating Koch's Description
- The Mastodon
- The Mammoth as Engraved by a Primitive Artist on a Piece of Mammoth Tusk
- The Largest Known Dinosaur
- The Horned Ceratosaurus, a Carnivorous Dinosaur
- The gigantic three-horned Reptile, Triceratops
- The Development of the Horse
- The Archæopteryx
- Some Reptiles of the Late Paleozoic Age
- Some Oligocene Mammals
- Some Mesozoic Reptiles
- Some Late Mesozoic Reptiles
- Skulls of Iguanodont and Trachodont Dinosaurs
- Skulls of Horned Dinosaurs
- Skulls of Dinosaurs, illustrating the principal types
- Skull of Phororhacos Compared with that of the Race-horse Lexington
- Skull of Ceratosaurus
- Skeleton of Tyrannosaurus in comparison with human skeleton
- Skeleton of Triceratops
- Skeleton of the Modern Horse and of His Eocene Ancestor
- Skeleton of the Mammoth in the Royal Museum of St. Petersburg
- Skeleton of an Extinct Flightless Toothed Bird, Hesperornis
- Skeleton of a Radiolarian Very Greatly Enlarged
- Restoration of a Lake Dwelling
- Reindeer Age Engravings and Carvings
- Reindeer Age Articles
- Pterodactyls
- Pterichthys, the Wing Fish
- Primitive Sledge
- Primitive Bread Making
- Prehistoric Whistle
- Pottery from Lake Dwellings
- Pithecanthropos Erectus
- Phororhacos, a Patagonian Giant of the Miocene
- Pariasaurus - An Extinct Vegetarian Triassic Reptile
- Palæomastodon
- Outline sketch restoration of Triceratops
- Outline Restorations of Dinosaurs
- Neolithic or New Stone Age Man
- Neolithic Implements
- Neanderthal Man
- Nautilus
- Nature's Four Methods of Making a Wing - Bat, Pteryodactyl, Archæopteryx, and Modern Bird
- Myotragus
- molars of elephants
- Miocene Mammals
- Map of Europe 50,000 Years Ago
- Mammoth Hunt