Dextrine, 173. Diagnosis, 85, 89. Diastases, 132. Diffusion, 53. Digestion, 133. _Digraphis_, 175. _Dilophia_, 188. _Dionaea_, 125. _Dipsacus_, 252. _Diptera_, 207. Dis-assimilation, 275, 277, 286. Discolorations, 179, 186, 192. Disease, 64, 91, 271, 272, 277, 287, 288, 290. Disease dodging, 168. Disease-fungi, 189. Disease of organs, 119. "Disease-proof" varieties, 168, 169, 171, 173, 177. Disease-resisting varieties, 177. Diseases of absorptive organs, 121. Diseases of assimilatory organs, 119. Diseases of bark, 120. Diseases of cambium, 120. Diseases of parenchyma, 120. Diseases of respiratory organs, 119, 121. Disintegration, 275. Distortions, 140, 246, 251, 252, 253. Dissemination of fungi, 142. Division, 127. Dodder, 113. _Dolium_, 134. Dormant buds, 224, 225, 257, 259, 260. Double flowers, 247, 256. Double ideals in selection, 168. _Dracaena_, 192. Drainage, 103. Drawing, 106, 180. Drip, 103. Drooping, 43, 179. Drops of water, 192. Dropsy, 228. Drought, 121, 183, 190, 191, 245, 248, 249. Dry-rot, 143, 237. Ducks, 144. Dutrochet, 7. Dwarfing, 246, 249. "Dying back," 190, 240, 242, 243, 244. Earwigs, 164, 207. _Eau Céleste_, 162. _Edelfäule_, 230. Eelworms, 111, 248. Effects of environment, 262. Eggs of insects, 187. Elaborated sap, 94. Elm, 218, 224, 225, 233, 260. _Empusa_, 163. Endemic diseases, 153, 160, 166. Endive, 180. Endophytes, 130. Endophytic algae, 128. Endophytic fungi, 193. Energy in plants, 15, 25, 287. Engelmann, 20, 27. _Entyloma_, 187. Enzymes, 10, 130, 132, 136. _Epichloë_, 218. Epicormic shoots, 224, 257, 260. Epidemics, 108, 109, 113, 115, 142, 153, 160, 163, 166. Epiphytes, 113, 130, 135, 137. Epiphytic algae, 188. Epiphytic fungi, 161, 193, 232. _Equisetum_, 113. Ergot, 131, 142, 144. _Erineum_, 88, 212, 214, 215. Erosions, 204, 207. _Erysipheae_, 135, 142, 161, 187, 268. Essentials of fertilisation, 69. Estimates of loss, 146. Etiolation, 106, 179, 180, 229. _Euphorbia_, 116, 134, 247, 266. Excavations, 204. Excess of food, 229. Excess of minerals, 102. Excess of water, 100. Excessive growth, 246. Excessive nutrition, 250. Excrescences, 114, 212, 222. Excreta, 45, 130, 133. _Exobasidium_, 128, 218. _Exoascus_, 116, 128, 188, 208, 214, 218, 225, 247, 253. Expense of materials, 161. Experiments necessary, 168. Exposure of roots, 179, 184. External causes of disease, 99. Extinction of species, 91. Exudations, 227. Exudation under pressure, 51. Factors of an epidemic, 149, 165. Falling of fruit, 206. Falling leaves, 123. False chlorosis, 181. False etiolation, 180. _Farfugium_, 188. Fasciations, 230, 246, 251. Fats, 272, 286. Feeding, 14, 16. Fermentation, 58, 102, 130, 233. Ferns, 113, 247, 260, 261.