Part 3

12. The Source of the Arveiron. Ice Pinnacles, Towers, and Chasms of the Glacier des Bois. Passage to the Montanvert 38

13. The Mer de Glace and its Sources. Our First Climb to the Cleft Station 43

14. Ice-cascade and Snows of the Col du Géant 46

15. Questioning the Glaciers 48

16. Branches and Medial Moraines of the Mer de Glace from the Cleft Station 51

17. The Talèfre and the Jardin. Work among the Crevasses 52

18. First Questions regarding Glacier Motion. Drifting of Bodies buried in a Crevasse 54 19. The Motion of Glaciers. Measurements by Hugi and Agassiz. Drifting of Huts on the Ice 69

20. Precise Measurements of Agassiz and Forbes. Motion of a Glacier proved to resemble the Motion of a River 60

21. The Theodolite and its Use. Our own Measurements 62

22. Motion of the Mer de Glace 66

23. Unequal Motion of the two Sides of the Mer de Glace 70

24. Suggestion of a new Likeness of Glacier Motion to River Motion. Conjecture tested 72

25. New Law of Glacier Motion 76

26. Motion of Axis of Mer de Glace 78

27. Motion of Tributary Glaciers 79

28. Motion of Top and Bottom of Glacier 80

29. Lateral Compression of a Glacier 81

30. Longitudinal Compression of a Glacier 84

31. Sliding and Flowing. Hard Ice and Soft Ice 86

32. Winter on the Mer de Glace 88

33. Winter Motion of the Mer de Glace 93

34. Motion of the Grindelwald and Aletsch Glacier 93

35. Motion of Morteratsch Glacier 95

36. Birth of a Crevasse: Reflections 98

37. Icicles 99

38. The Bergschrund 102

39. Transverse Crevasses 103

40. Marginal Crevasses 105