| The Majestic, Largest Steamship in the World | Frontispiece |
| FACING PAGE | |
|---|---|
| Eohippus—From Which the Modern Horse Developed | 16 |
| Ornitholestes—A Prehistoric Animal of America | 17 |
| Huntsman, Horse, and Hunting Dog of Long Ago—From an Ancient Cretan Fresco | 17 |
| Prehistoric Paintings—An Exhibition of Copies from the Cavern at Altamira, Spain | 24 |
| Saber-Toothed Tiger That Once Roamed Over North America | 25 |
| Gutenberg's Printing Presses—Models on Exhibition | 32 |
| Benjamin Franklin's Printing Press | 33 |
| Model of the "Santa Maria," the Flagship of Columbus | 48 |
| Curtiss Navy Racer, the Airplane That Won the Pulitzer Race of 1921 | 49 |
| U. S. Army Dirigible on a Transcontinental Flight | 49 |
| Electric Motor of 1834 | 64 |
| Turning Lathe of 1843 | 64 |
| Edison Phonograph of 1878 | 65 |
| Whitney's Cotton Gin | 65 |
| De Witt Clinton Train of 1831 Beside a Modern Locomotive | 80 |
| Locomotive of the 1870 Period | 81 |
| "John Bull," a Locomotive Brought from England in 1831 | 81 |
| Weather and Astronomical Instruments on the Roof of Greenwich Observatory, England | 112 |
| Mooring Tower for Airships, with the "R-24" Fastened Head On | 113 |
| Hospital Room in Which Infected Articles Are Sterilized | 160 |
| Modern Operating Room in Paris, Fitted with a Glass Dome and Radio Microphones for Observing Students and Doctors | 161 |
| Edouard Belin and the Telautograph, which Transmits Pictures by Wire | 176 |
| Lee De Forest, Inventor of the Oscillating Audion | 177 |
| Automobile with Radio Equipment for Listening in En Tour | 177 |
| Gifts for Tutankhamen Brought by One of his Viceroys | 192 |
| Tutankhamen's Tomb—Bringing Up the Hathor Couch | 193 |
| Queen Nefertiti, Mother-in-Law of Tutankhamen and Wife of Ahknaton | 193 |