INDEX. 



Aar, terraces on, very fine, 39. 



Abert, Lt. J. W., his description of tlie Grand 

 Canon on the Canadian, 113. 



Agassiz, Prof, on terraces around Lake Superior, 

 31, 61. 



Agassiz, Prof, on glacier action in Switzerland, 132. 



Agawam river, its basins, 13. 



Agawam river, former beds of, 49. 



Agawam river, gorge on, 100. 



Alluvium, contemporaneous with all geological 

 periods, 63. 



Alluvium and drift, varieties of the same forma- 

 tion, 73. 



Alluvial agencies parallel to those of drift, 13. 



American Continent, how often submerged, 86. 



American river, California, gorge on, 100. 



Aneroid barometer, its value in geology, 10. 



Arrangement of terrace materials, 9. 



Arve, terraces on the, 41. 



Au Sable river, gorge on, 111. 



B. 



Barometer, Aneroid, its value, 10. 



Barometer, Syphon, Greene's, 10. 



Basins, former, in the Connecticut valley, 11. 



Beaches, ancient and modern, 2, 6. 



Beaches, lithological characters of, 6, 7. 



Beaches, ancient, the highest, 51. 



Beaches, ancient, how formed, 55. 



Beaches, ancient, tabular view of their height, 76. 



Beaches, ancient, shown on the maps, 14. 



Beaches, ancient, in Pelham, Shutesbury, Heath, 

 and Washington, 27. 



Beaches, ancient, in Peru, Dalton, Conway, and 

 Ashfield, 28. 



Beaches, ancient, at Pranconia Notch and White 

 Mt. Notch, 29. 



Beaches, ancient, between N. London and Nor- 

 wich, 29. 



Beaches, ancient, between Schenectady and Spring- 

 field, 29. 

 19 



Bed of former river in Orange, N. H., 47. 



Beds of former rivers in Cavendish, Vt., and on 



Deerfield river, 48. 

 Beds of former rivers on Green and Agawam 



rivers, 49. 

 Bellows Palls, erosions at, 98. 

 Berkshire county, moraine terraces in, 33. 

 Bicarbonate of lime, an agent of erosion, 83. 

 Big Canon on the Bio Colorado, 116. 

 Black river, Vt., old bed of, 102, 104. 

 Blocks, erratic, above terrace materials, 8. 

 Boulder clay of Scotland, 9. 

 Brattleborough, erosions at, 99. 

 Brogniart on tertiary rocks, 1. 

 Burgess, Bev. Ebenezer, on the gorges of the 



Ghaut Mts., India, 120. 

 Burgess, Bev. Ebenezer, on Table Mt., South 



Africa, 120. 



C. 



Cader Idris, its height by Aneroid, 10, 34. 



Canon, the Grand, on the Canadian, 112. 



Canon of Chelly in New Mexico, 113. 



Canada (little Canon) in New Mexico, 117. 



Cape Cod, moraine terraces upon, 33. 



Cape Cod, action of the ocean upon, 86. 



Carbonic acid, an agent of erosion, 83. 



Chambers, Bobert, on ancient sea margins, 2, 9. 



Chambers, Bobert, on Surface Geology, 34. 



Chambers, Bobert, on Scandinavian terraces, 43, 

 66. 



Chambers, Bobert, on a delta terrace, in Switzer- 

 land, 56. 



Chambers, Bobert, shows how lateral terraces 

 were formed, 57. 



Chamouny, terraces near, 41. 



Chapin, F. P., his Pentagraphic Delineator, 7. 



Class of 1856, in Amherst College, names Mt. 

 Pocumtuck, 27. 



Class of 1857, names Kilburn Peak, 97. 



Cold, why greater during the drift period, 72. 



Cold river in N. Hampshire, 24. 



Conclusions respecting surface geology, 49. 



