Armies, 102, 107, 111. Ash, 66, 124. Aspen, 7, 123. Aspens, 181, 182. Asters, 71, 122. August, 113, 114, 117, 134. Autumn, 20, 45, 51, 72, 92, 118, 119, 122, 125, 134, 135, 144, 152, 157, 166, 196. Audubon hermit-thrush, 190. Avalanches, 182. Balsam, 3, 6, 57, 66, 68. Bamboos, 117. Banks, the, 205. Barberry, 3, 58, 124. Bare branches, 126. Bark, 157, 158. Barn-swallows, 26. Basalt, 59. Battle, 102. Battlefield, 103. Bayberry, 3, 118, 127. Beach, 76, 132, 183, 196, 197, 205. Bear, 193. Beech, 126, 156, 157, 186. Beechnuts, 145, 160. Bees, 30, 31, 51, 55-57, 60, 67, 78-80, 82, 83, 89, 182. Beetles, 34, 35, 150. Bee-tree, 67. Beggar-ticks, 121. Bellworts, 21, 62. Bent grass, 57. Berkshires, 185. Berries, 113, 114, 126, 161. Bighorn, 178. Big tree, 186. Billows, 203. Bindweed, 69. Birch, 12, 32, 33, 57, 90, 117, 120, 123, 157, 158, 186. Black alders, 168. Black-and-white creepers, 39, 40. Black ant, 91, 96, 102, 104-110. Blackberries, 2, 63, 75, 118, 123, 148. Black birch, 117, 158. Blackcap raspberries, 146. Black cherry, 158. Black colonies, 4. Black-headed grosbeak, 182. Black oak, 157. Blacksnakes, 155. Black-throated blue warbler, 66. Black-throated green warblers, 40. Bloodroot, 20, 21, 60. Blueberry, 11, 12, 64, 113, 159. Bluebird, 1, 13, 14, 34, 41, 114, 117. Blue-headed vireo, 8. Bluets, 20, 57. Blue violets, 20. Boat, 207. Bobolink, 24, 43. Bob-white, 24, 42, 70, 160-162. Bog, 56, 57, 122, 165, 168. Bog-rush, 57. Bokhara, 126. Boleti, 116. Bombus, 78. Boulders, 6, 57, 91, 94, 122, 127-135, 140, 181. Bouncing-bet, 56. Brakes, 122. Brazil, 24. Briers, 147, 148. Brook, 61, 138, 168-171. Broom-moss, 117. Brown ants, 109, 111, 112. Brown hackle, 195. Brush, 90. Bryum, 117. Buckwheat, 145. Bulldogs, 102. Bullfrogs, 114. Bumblebee, 67, 78, 80. Bunchberry, 67. Bunchberries, 113. Burdock, 59, 63, 73. Bur-reeds, 152. Burrow, 16, 155. Burs, 121. Buttercup, 57. Buttercup seed, 145. Butterflies, 55, 93. Butterfly-weed, 72. Butternut, 3, 66, 121. Buttes, 183. Button-bushes, 164, 165. Byroads, 71, 73. Caches, 125. Calms, 207. Camp, 189-192. Canada, 66, 130. Canada thistle, 75. Canada violet, 62. Cañons, 180-182, 185, 189, 192. Cañon-wren, 180, 182. Capsules, 119. Captivity, 112. Cardinal, 47. Carolina wren, 47. Carpenter-bees, 30. Carrot, 63, 66, 74. Cascade, 185. Cassandra, 168. Cat, 27. Catbird, 30, 44-46, 49. Catbrier, 118, 148. Caterpillars, 92, 93. Catkins, 13. Cattails, 38, 150, 152. Cedar, 34. Cedars, 186. Cells, 82, 83. Cetraria, 159. Ceylon, 117. Chalcid fly, 82, 83, 92. Chant, 46, 47, 169, 191, 198. Chaos, 201. Chaparral, 190. Checkerberry, 80. Cherry, 2, 3, 64, 66, 113, 158. Chestnut-bur, 121. Chestnuts, 121, 145. Chestnut warbler, 26, 39. Chewink, 41. Chickadee, 41, 47, 158, 159, 166. Chickory, 74. Chipmunk, 15, 136, 139, 140, 144, 145, 155. Chipping-sparrow, 37, 38, 118. Chirping, 53.