Ascomycetes, 189, 217, 269. _Ascochyta_, 190. Ash, 182, 223, 225, 251. _Asparagus_, 180, 230, 251, 252. _Aspergillus_, 231. _Aspergillus niger_, 58. _Aspidiotus_, 187. Assimilation, 8, 21, 133, 271, 275, 277, 285, 286. Assimilates, 274. Atmosphere, 1, 99. Atmospheric influences, 101. Atrophy, 246, 247, 266. Attractive substances, 136. _Aucuba_, 264. Autumnal colouring, 191. Autumnal fall, 93. Avalanches, 106. Bacteria, 102, 133, 143, 168, 173, 176, 182, 190, 200, 216, 219, 223, 227, 231, 236, 237. Bacteriosis, 227. Barberry, 176. Bark boring, 204, 205. Bark-beetles, 205. Barley, 176, 248. Barrenness, 246, 249. Bats, 244. Bean, 188, 190, 191, 268. Beech, 192, 222, 223, 225, 233, 240, 242, 254, 269. Beech Miner, 208. Bees, 142, 143, 164. Beet, 192, 216, 219, 230. Beet-rot, 230. Beetles, 110, 143, 145, 205, 206, 207, 248, 254. Berkeley, 85. Bilberries, 116, 142, 217, 218, 248. Biology of soil, 56, 102. Birch, 207, 218, 224. Birds, 108, 144, 164, 166. Bird's-eye Maple, 224. Black spots on leaves, 186, 189, 191. Bladders, 218. Blemish, 198. Blights, 86, 104, 179. Blisters, 230. Blue rays, 21. _Bombyx_, 187, 218. Bordeaux mixture, 162. Boring, 204. _Botrytis_, 131, 132, 136, 175, 230, 231, 243, 288. Boussingault, 5, 10. Bouvardia, 260. Bramble, 112. Branch stumps, 194, 199. Brand, 240. Breeding, 78. Briars, 113. Broom-rapes, 265. Browning, 122, 186, 235. Brown spots, 186, 189, 190, 191. Browsing, 244. _Bruchus_, 248. Bruises, 194, 203, 240, 241. Bryony, 112. _Bryophyllum_, 260. Bud galls, 219. Bud variations, 92, 93. Bulb diseases, 227. Buried objects, 211, 269. Burning, 191. Burning-glass effect, 192. Burrows, 204, 205. Burrs, 222, 223, 224. Bursting of fruits, 227, 230. Butterflies, 145. Bye-products, 276. Cabbage, 253. Cabbage moth, 208. _Caeoma_, 252. _Caesalpinia_, 233. Calcium, 272. Calcium oxalate, 138. _Calla_, 183. _Calliandra_, 233. Callus, 119, 120, 124, 139, 140, 196, 197, 199, 201, 202, 210, 241, 260, 263, 269. _Calyptospora_, 116, 217. Cambium, 120, 196, 199, 222. Camellia, 187. Cancer, 127. Canker, 87, 222, 223, 241. _Capnodium_, 232. _Capsella_, 116, 175, 252. Carbohydrates, 16, 17, 20, 34, 122, 184, 272, 273, 277. Carbolic acid, 162. Carbon, 272. Carbon assimilation, 8, 10, 28, 106. Carbon-bisulphide, 163. Cardinal points, 288. Carrot, 164. _Carpocapsa_, 207. Cast branches, 123. Castor oil, 172. Caterpillars, 109, 164, 207, 208, 244, 254, 259. Cats, 164. Cattle, 108. Cauliflowers, 247, 250. Causes of disease, 89, 99, 108, 159, 278, 282. _Cecidia_, 212. _Cecidomyia_, 182, 213, 214, 218, 219, 254. Celery, 180, 230. Cell contents, 168. Cell-protoplasm, 279, 280, 290. Cellulose, 132, 277, 286.