INDEX. 



305 



Preventible diseases, 159. 

 Prolepsis, 257, 259. 

 Proliferations, 257, 258. 

 Properties of soil, 57. 

 Proteids, 132, 13S, 272, 277, 



286. 

 Proteolytic enzymes, 132. 

 Pfotof/iyces, 217. 

 Protoplasmic molecules, 276, 



278, 286. 

 Protoplasm, 33, 41, 271, 272, 



274, 276. 

 Pruning, 105, 143, 194, 225, 250. 

 Prussic acid, 163, 165, 173. 

 Fsylla, 253. 

 F/tir?;/u7,S8, 114, 169, 175, 176, 



188, 189, 252, 247. 

 Puckers, 214, 235, 246, 253. 

 Puffing of spores, 142, 144. 

 Punctures, 212. 

 Pure culture, 166. 

 Purple-black spots, igi. 

 Pustules, 188, 190, 212, 217. 

 Putrefaction, 234. 

 Pyrethruni, 161. 

 Pyrus, 214. 

 Pythiuni, 114, 1 19, 136, 144. 



160, 230. 



Quassia, 161. 

 Quinine, 173. 



Rabbits, 108, 142, 164, 194. 



Rain trees, 233. 



Rankness, 97, 227, 22S. 



Rats, 108, 163. 



Rays of light, 18. 



Red light, 21. 



Red spider, 161, 187, 1S8, 192. 



Red spots, 188, 253. 

 References in Bible, 85. 

 Remedial measures, 89. 

 Repellent substances, 136. 

 Reproduction, 72, 281. 

 Reserves, 274. 

 Resin, 125. 

 Resin-flux, 234. 

 Resinosis, 227, 234. 

 Resistance to disease, 155, 268. 

 Resistant races, 172. 

 Respiration, 17, 31, 130, 271, 



275, 276, 285, 2S7. 

 Reversions, 73. 

 Rhinanthoideae, 265. 

 Rhiiianthus, 112. 

 Rhizobinin, 289. 

 Khizoctonia, 238. 

 Rhizomorph, 145. 

 Rhododendron, 218. 

 Rhubarb, 180, 230. 

 Khynchitis, 254. 

 Khytisina, 188. 

 Ribbon grass, 183. 

 Ribes, 214. 

 Rice, 172. 



Rimpau's experiments, 69, 73, 77. 

 Ringing, 194, 201, 202, 210. 

 Ripened wood, 243. 

 Robinia, 259. 

 Rodents, 109. 

 Roestelia, 217. 

 Rolled leaves, 86, 

 Root, 9, 35, 96, 120, 227, 270. 

 Root-absorption, 181. 

 Root-diseases, 119, 120. 

 Root-excretions, 46. 

 Root-fusions, 262. 

 Root-galls, 221. 



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