LIST OF ILLUSTRATIONS 



Front of Muir Glacier, Alaska, from the southeast corner, looking across the sur- 

 face and up one of the tributaries Frontispiece. 



FIG. PAGE 



1. Differential motion of ice . ... . 2 



2, 3. Differential motion of ice 3 



4. Plasticity of ice 6 



5. Fissures and seracs .• 8 



6. 7. Marginal fissures and veins 8 



8. Veined structure at the junction of two branches 9 



9. Mode of formation of ice-pillars 10 



10. Moraines of the Mer de Glace 10 



11. Glacial scorings 12 



12. West end of Samovar Glacier, Alaska 14 



13. Mount Shasta, California. (Russell.) 17 



14. Mount Tacoma, Washington State, looking westward. (Charles S. Fee.) . . 20 



15. Mount Tacoma, Washington State, looking eastward. (Charles S. Fee.) . . 21 



16. Map of southeastern Alaska 24 



17. Norris Glacier, Alaska. (Partridge.) 26 



18. Glacier Station, British Columbia. (Canadian Pacific Railroad.) . . .28 



19. Davidson Glacier, Alaska 29 



20. Map showing hypothetical former extension of glaciers. (U. S. Geological 



Survey.) . 31 



21. Map of Alaska 34 



22. Sketch map of Glacier Bay and Muir Glacier. (H. F. Reld.) . . 44 



23. Looking across front of Muir Glacier, Alaska 46 



24. Map of Muir Inlet, Alaska 53 



25. Surface of Muir Glacier. (Partridge.) 56 



26. Formation of kettle-hole. Alaska. (Partridge.) 58 



27. Buried forest on the Muir Glacier 62 



28. Buried forest, Glacier Bay, Alaska 63 



29. Muir Glacier from an elevation of 1,800 feet 65 



30. Ice-pillars. (Russell.) 70 



31. Map of Greenland 76 



32. Map of Frederlckshaab Glacier, Greenland. (Dana.) 81 



33. Ikamlut Fjord, Greenland, showing hanging glaciers 83 



34. Sea margin of Cornell Glacier, Greenland 103 



35. Glacier in North Greenland, showing upper strata of ice rolling over like breakers 103 



36. Morteratsch Glacier, Switzerland . 105 



37. Svartisen Glacier, Norway. (WarDer.) 106 



38. Iceberg 116 



39. Floating berg 119 



40. Scratched stone from till of Boston, Mass 123 



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