ILLUSTRATIONS 



Plate. Tyrannosanrus rex, the "king of the tyrant saurians" . . Frontispiece 



FIG. PAGE 



1. The moon's surface 30 



2. Deep-sea ooze, the foraminifera 32 



3. Light, heat, and chemical influence of the sun 44 



4. Chemical life elements in the sun 46 



5. The earliest phyla of plant and animal life 50 



6. Hydrogen vapor in the solar atmosphere 60 



7. Hydrogen flocculi surrounding sun-spots 61 



8. The sun, showing sun-spots and calcium vapor 64 



9. Chemical life elements in the sun 65 



10. Hand form, determined by heredity and secretions 76 



11. Fossil and living bacteria compared 85 



12. Protoplasm and chromatin of Anuvba 93 



13. The two structural components of the living world 94 



14. Chromatin in Sequoia and Trillium compared 96 



15. Fossil and living algae compared 102 



16. Typical forms of Protozoa 112 



17. Light, heat, and chemical influence of the sun 113 



18. Skeletons of typical Protozoa 115 



19. Map — Late Low^er Cambrian world environment 119 



20. A Mid-Cambrian trilobite 121 



21. Brachiopods, Cambrian and recent 123 



22. Horseshoe crab and shrimp, Cambrian and recent 124 



23. Map — Middle Cambrian world environment 125 



24. Sea-cucumbers, Cambrian and recent 127 



xxvii 



