xxn CONTEXTS 



P 19. The Motion of Glaciers. Measurements by Hugi and Agassiz, 



Drifting of Huts on the Ice . . . . 39 



20. Precise Measurements of Agassiz and Forbes. Motion of a Glacier 



proved to resemble the Motion of a River . . ,50 



2 1 . The Theodolite and its Use. Our own Measuremehts . . 02 



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 .... 



25. New Law of Glacier Motion 



26. Motion of Axis of Mer de Glace 



27. Motion of Tributary Glaciers . 



28. Motion of Top and Bottom of Glacier . 



29. Lateral Compression of a Glacier 



30. Longitudinal Compression of a Glacier . 



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



32. Winter on the Mer de Glace 



33. Winter Motion of the Mer de Glace 



34. Motion of the Grindelwald and Aletscb Glacier 



35. Motion of Morteratsch Glacier 



36. Birth of a Crevasse: Reflections 



37. Icicles . 



38. The Bergschrund 



39. Transverse Crevasses 



40. Marginal Crevasses 



41. Longitudinal Crevasses . 



42. Crevasses in relation to Curvature of Glacier . 



43. Moraine-ridges, Glacier Tables, and Sand Coaes 



44. The Glacier Mills or Moulin s . 



♦5. The Changes of Volume of Water by Heat and Cold 



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