Vlll LIST OF FIGURES 



PAGE 



13. Diagram Illustrating the Assumptions on which Calculation 



of the Bouguer Anomaly of Gravity Is Based 29 



14. Bouguer and Isostatic Anomalies of Gravity in Certain Regions 30 



15. Limits of the Last Ice-cap on Fennoscandia 35 



16. Outflow of the Fennoscandian Ice from the Center 



of Accumulation 36 



17. Map Showing Crustal Recoil in Region of Fennoscandia 37 



18. Lines of Equal Rates of Current Upheaval in Fennoscandia 38 



19. Map of Southern Finland, Illustrating Current Upwarping 



and also Isobases for a Late-glacial Sea Beach 39 



20. Amount of Upwarp Still Needed to Bring the Earth's Crust of the 



Fennoscandian Region into Balance with the Crust Elsewhere 41 



21. Mean Anomalies of Gravity in Three Belts of Finnish Territory 43 



22. Stereogram to Illustrate the Earth-shells 46 



23. Map of Niaufou Island facing 50 



24. Map of Upolu Island, Samoa facing 50 



25. Stages in the Reduction of a Volcanic Island to a Shoal 



at Wave-base 52 



26. Stages in the History of Krakatoa 54 



27. Map of Ofu and Olosega Islands, Samoa 55 



28. Night View of Kilauea Lava-lake facing 56 



29. A River of Incandescent Hawaiian Lava facing 56 



30. Inferred Character of the Earth's Outer Shells at an Older 



Geological Epoch 59 



31. The Relation of Substratum to Volcanism 60 



32. Free-air Anomalies of Gravity in Oahu Island 63 



33. Anomalies of Gravity in Hawaii Island 64 



34. Map of Bermuda Island and Surrounding Bank 66 



35. Sections Summarizing Logs of Bore-holes in Bermuda Island, 



Michaelmas Cay, and Heron Island 66 



36. Map of Barrier Reef Around the Truk Islands 68 



37. Map of Atolls in the Caroline Group 69 



38. Map of Mille or Mulgrave Atoll 70 



39. Map of Suva Diva Atoll 71 



40. Sections Illustrating Flatness of the Floors of Reef Lagoons 72 



