Accidents, 144. 



Age, 14, 193- 



Air, blanket over pond, 202, 203. 



American Fur Company, 49. 



Arkansas River, 218. 



Astor, John Jacob, 49. 



Attitudes, 6. 



Audubon, John James, 53. 



Autumn activities, beginning of, 200. 



Bad Lands, 65. 



Basins, food, 108. See also Wells. 



Beaver, a tame, 22-25. 



Beaver, aged, of the Spruce Tree Col- 

 ony, 83, 84, 95, 96 ; of Lily Lake, 

 102-105; migrating to the Moraine 

 Colony, 167, 168. 



Bedding, 122, 123, 



Bierstadt Moraine, 140. 



Bobcat, 35. 



Burrows, no, in ; a substitute for 

 houses, 127, 128. 



Canada, emblem of, 43. 



Canals, 77, 78, 88, 141, 145-149, 187; 

 at Lily Lake, 103, 104 ; importance, 

 105 ; use of excavated material, 105, 

 1 06; forms of, 1 06, 107; system at 

 Three Forks, Mont., 107-111; dug 

 in winter, 206. 



Castoreum, 43, 44. 



Chasm Lake, 142. 



Civilization, the beaver's influence on, 

 47-49- 



Color, 8. 



Colorado River, 25, 50. 



Cooperation, 171. 



Coyotes, 23, 102, 161-163, l66 - 



Cry, 27. 



Cutting trees, methods of, 10-12, 31, 

 32; intelligence shown in, 57, 91; 

 operations observed, 86, 90-96; ac- 

 cidents in, 144. 



Dams, materials, 65-67 ; construction, 

 66, 67 ; uses, 69 ; growth, 69, 70 ; new 

 and old, 70, 71 ; discharge from, 71, 

 72 ; not all beaver build, 72 ; thor- 

 oughfares, 73 ; effect on topography, 

 73, 74 ; shape, 75-77 ; an interesting 

 dam, 76-78 ; waterproofing, 78 ; di- 

 mensions of a long dam, 78, 79 ; di- 

 mensions of other dams, 86 ; across 

 canals, 108-110 ; the dead-wood dam, 

 143-150; across a drainage ditch, 

 180, 181 ; across an irrigation ditch, 

 189, 190; a homesteader's dam com- 

 pleted by beaver, 192, 193 ; effect on 

 stream-flow, 213-217. 



Day, working by, 33, 94, 156. 



Death, 14. 



Ditch, struggle over a, 179-182. 



Ditches. See Canals. 



Diver, the young beaver, 22-25. 



Domestication, 25. 



Dunraven, Lord, 179. 



Ears, 7. 



Enemies, 14; times of danger from, 

 98. 



225 



