294 



DISEASE IN PLANTS. 



Ants, 232. 



Aphis, 88, 109, 161, 165. 188, 



213, 214, 232, 241, 253. 

 Aphrophora, 233. 

 Apogamy, 257, 261. 

 Aporia Crataegi, 187. 

 Apospoiy, 257, z6i. 

 Apple, 170, 171, 187, 189, 192, 



206, 217, 218, 219, 223, 



226, 231, 233, 248, 249, 



253. 254. 

 Apricot, 188, 206. 

 Apricots, 234. 



Area of root-surface, 37, 39. 

 Arisarut)i, 188. 

 Aristolochia, 259. 

 Aroids, 113. 

 Arrest of growth, 246. 

 Arsenic, 162. 

 Artificial wounds, 194. 

 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, I, 99. 

 Atmospheric influences, loi. 

 Atrophy, 246, 247, 266. 

 Attractive substances, 136. 

 Ancuha, 264. 

 Autumnal colouring, 191. 

 Autumnal fall, 93. 

 Avalanches, 106. 

 Bacteria, 102, 133, 143, 16S, 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, no, 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. 

 Birds'-eye Maple, 224. 

 Black spots on leaves, 186, 189, 



191. 

 Bladders, 218. 

 Blemish, 198. 

 Blights, 86, 104, 179. 

 Blisters, 230. 

 Blue rays, 21. 

 Bovibyx, 187, 218. 

 Bordeaux mixture, 162. 

 Boring, 204. 

 Botrytis, 131, 132, 136, 175, 230, 



231, 243, 288. 

 Boussingault, 5, 10. 

 Bouvardia, 260. 



