X The Origin of Life 245 XI Some General Conclusions 281 APPENDIX A. Geological Relations of Eozoon, etc. 295 B. Organic Remains and Hydrous Silicates 298 C. Affinities of Eozoon, etc. 303 D. Cryptozoon 310 E. Receptaculites and Archæocyathus 315 F. Pre-Geological Evolution 320 G. Controversies respecting Eozoon 324 H. Notes to Appendix, December, 1896 329 LIST OF ILLUSTRATIONS FIG. PAGE Cryptozoon Boreale _Frontispiece_ Map xvi 1. Olenellus 20 2. Triarthrus 23 3. Hymenocaris 27 4. Ctenichnites 32 5, 6. Archæocyathus 35 7, 8. Cryptozoon 37, 39 9. Fossils in Lower Cambrian Boulder 41 10. Section Hanford Brook 51 11. Worm Tracks 53 12. Pre-Cambrian Fossils 54 13. Arenicolites and Aspidella 54 14. Cryptozoon 56 15. Worm Burrows 67 16. Casts of Foraminifera 68 17. Tudor Eozoon 69 18. Laurentian America 85 19. Map of Grenville Limestones 88 19A. Attitude of Limestone, Côte St. Pierre 91 20, 21. Disturbed Beds 103 22. Section of Limestone 113 23. Silicification of Coral 113 24. Cast of Polystomella in Glauconite 115 24A. Crinoid and Shell in Glauconite 116 25. Nature-print of Eozoon 121 26, 27. Eozoon from Calumet 130 28, 29. Canals of Eozoon 133 30, 31. Canals and Tubuli 135 32. General Form of Eozoon 149 33, 34. Eozoon with Funnels 152, 153 35. Small Specimen and Structure 155 36. Decalcified Eozoon 157 37.