3o6 



DISEASE IN PLANTS. 



Root-hairs, 34, 102, 163. 



Root-nodules, 212, 219. 



Root-parasites, 112, 265. 



Root-rot, 230. 



Roses, 232, 243, 257, 268, 27S. 



Rosettes, 225. 



Rot, 97, 182, 227, 229, 231, 236. 



Rotation of crops, 69, 166. 



Rotifer, 140. 



Rot-organisms, 200. 



Rotting of wounds, 87. 



Rouen law, 85. 



Rushes, 114. 



Rust, 122, 142, 171, 172, 175, 



191. 

 Rye, 176, 248. 



Saccharomyces, 60. 



Sachs, 7, 36. 



Salvia^ 2 1 4. 



San Jose scale, 187. 



Sand-blast action, 184. 



Sandy soils, 184. 



Saperda, 205. 



Saprophytes, 135, 137, 175, 234, 



243, 244. 

 Scab, 189, 216. 

 Scale, 187. 

 Schinzia, 114. 

 Schizoiiciira, 223. 

 Scion, 183, 262, 264, 266, 2S2. 

 Scleroderris, 223. 

 Sclerotia, 143. 

 Schwarz, 39. 

 Sclerodnia, 142, 143, 144, 231, 



248, 249, 288. 

 Scolytidae, 205. 

 Scorching, 240, 241. 

 Scurf, 216. 



Sea-kale, 261. 



Secale, 76. 



Secretions, 130, 133, 173, 274. 



Sedges, 189. 



Seedless grapes, 247. 



Selandria, 20S. 



Selection, 69, 74, 78, 169. 



Selective absorption, 53, 65. 



Self- fertilisation, 281. 



Semi-parasites, 112. 



Senecio, 188. 



Sensitive plant, 125. 



Septoria, 114, 187. 



Sewage waters, 59. 



Sexual act, 72. 



Shaded foliage, 113. 



Shanking, 246, 249. 



Shoots from old wood, 260. 



Shot holes, 204, 208, 209. 



Silver fir, 224. 



Silver leaf, 192. 



Sirex, 206. 



Skeleton leaves, 204, 207. 



Slime flux, 227, 233. 



Slime fungus, 219. 



Slugs, III, 164, 207, 269. 



Smut, 117, 143, 162, 190. 



Snails, III, 142, 207. 



Snow, 106. 



Soap, as insecticide, 161. 



Soil, 1, 42, 99, 102, 142, 163. 



Soil-bacteria, 60. 



Soil-filtration, 59. 



Soil -organisms, 61, 143. 



Solar energy, 135. 



Somatoplasm, 267. 



Sooty moulds, 135, 190, 232. 



Sorbiis, 207. 



Sorosporhim, 216. 



