| Fig.1. | — Frontal view of the Cranial Dome of Pithecanthropus | 16 |
| Fig. 2. | — Frontal view of the same Greek skull as that shown in the frontispiece | 16 |
| Fig. 3. | — Eoliths, of ‘borer’ shape, from Ightham, Kent | 18 |
| Fig. 4. | — Eoliths of trinacrial shape, from Ightham, Kent | 20 |
| Fig. 5. | — Brain casts of four large Mammals | 23 |
| Fig. 6. | — Spironema pallidum, the microbe of Syphilis discovered by Fritz Schaudinn | 37 |
| Fig. 7. | — The Canals in Mars | 43 |
| Fig. 8. | — The Canals in Mars | 44 |
| Fig. 9. | — Becquerel’s shadow-print obtained by rays from Uranium Salt | 73 |
| Fig. 10. | — Diagrams of the visible lines of the Spectrum given by incandescent Helium and Radium | 76 |
| Fig. 11. | — The transformation of Radium Emanation into Helium (spectra) | 83 |
| Fig. 12. | — Dry-plate photograph of a Nebula and surrounding stars | 90 |
| Fig. 13. | — The Freshwater Jelly fish, Limnocodium | 97 |
| Fig. 14. | — Polyp of Limnocodium | 97 |
| Fig. 15. | — Sense-organ of Limnocodium | 97 |
| Fig. 16. | — The Freshwater Jelly-fish of Lake Tanganyika | 98 |
| Fig. 17. | — Sir Harry Johnston’s specimen of the Okapi | 99 |
| Fig. 18. | — Bandoliers cut from the striped skin of the Okapi | 99 |
| Fig. 19. | — Skull of the horned male of the Okapi | 100 |
| Fig. 20. | — The metamorphosis of the young of the common Eel | 101 |
| Fig. 21. | — A unicellular parasite of the common Octopus, producing spermatozoa | 102 |
| Fig. 22. | — The Coccidium, a microscopic parasite of the Rabbit, producing spermatozoa | 102 |
| Fig. 23. | — Spermatozoa of a unicellular parasite inhabiting a Centipede | 103 |
| Fig. 24. | — The motile fertilizing elements (antherozoids or spermatozoa) of a peculiar cone-bearing tree, the Cycas revoluta | 104 |
| Fig. 25. | — The gigantic extinct Reptile, Triceratops | 106 |
| Fig. 26. | — A large carnivorous Reptile from the Triassic rocks of North Russia | 107 |
| Fig. 27. | — The curious fish Drepanaspis, from the Old Red Sandstone of Germany | 107 |
| Fig. 28. | — The oldest Fossil Fish known | 108 |
| Fig. 29. | — The skull and lower jaw of the ancestral Elephant, PalÆomastodon, from Egypt | 109 |
| Fig. 30. | — The latest discovered skull of PalÆomastodon | 110 |
| Fig. 31. | — Skulls of Meritherium, an Elephant ancestor, from the Upper Eocene of Egypt | 111 |
| Fig. 32. | — The nodules on the roots of bean-plants and the nitrogen-fixing microbe, Bacillus radicola, which produces them |
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