INDEX. 



307 



Sour-rot, 231. 

 Sparrows, 164. 

 Specialised races, 168, 176. 

 Specific predisposition, 155. 

 Spectrum, 19, 21, 26. 

 Sphaerella, 189. 

 Sphaerotheca, 187. 

 Spermagonia, 144, 232. 

 Sphaeroblasts, 222, 225. 

 Spicaria, 237. 

 Spiral grooving, 204, 210. 

 Spiral growth, 252. 

 Spongospora, 216. 

 Spontaneous variations, 78, 246, 



255- 

 Spores, 144. 



Sports, 93, 247. 



Spots on leaves, 120, 186. 



Spraying, 159, 161, 162. 



Spreading of disease, 142. 



Squirrels, 108. 



Stag-head, 240, 244. 



Starch, 9, 16, 17, 20, 23, 138, 



173- 

 Statistics of epidemics, 147. 

 Steeping, 161. 

 Stem diseases, 120. 

 Sterenni, 206. 

 Sterility of soil, 61. 

 Stimulation, 119. 

 Stimuli, 126, 127, 139. 

 Stock, 262, 264, 266, 282. 

 Stomata, 23. 



Stool-shoots, 201, 225, 269. 

 Stool stumps, 194, 201. 

 Strangulations, 204, 209. 

 Strawberry, 189, 257. 

 Stripping, 194, 197. 

 Stroma, 217. 



Structure, 274. 

 Structure of protoplasm, 271. 

 Structure of root-hairs, 40. 

 Struggle for existence, 105, 159, 



164, 165, 167, 286. 

 Study of causes, 85. 

 Stumps, 194. 

 Subsoil, 57, 103. 

 Substitutive selections, 286. 

 Suckers, 225, 260. 

 Sugar, II, 17, 20, 173, 286. 

 Sugar cane, 172. 

 Sugar cane disease, 166. 

 Sulphate, 273. 

 Sulphur, 161, 163, 272, 

 Sulphurous acid, 181. 

 Sun-burn, 240, 241. 

 Sun-cracks, 240, 242. 

 Sundew, 232. 

 Sunflower, 256, 264. 

 Sun-spots, 192. 

 Superstitions, 85. 

 Surface energy, 26. 

 Surface roots, 112. 

 Sweet almond, 173. 

 Symbiosis, 63, 130, 137, 219, 



263, 265, 268, 285. 

 Symptoms of disease, 89, 122, 



179, 186. 

 Synchytriuin, 127, 188, 217, 247. 

 Synthesis, 65. 

 Syrhiga, 259. 

 Syringing, 161, 164. 



Tamarisk, 235. 

 Tannin, 138. 

 Taphrina, 218. 

 Tar, 164. 

 Tea, 244. 



