| The Majestic, Largest Steamship in the World | [Frontispiece] |
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| 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] |