398 



INDEX 



Plume, 35S. 



Plumule, 374. 



Pollen, 272 ; eerniiiiation, 275, 276 ; 

 grains, 286 ; injured by water, 

 295. 



Pollination, 277, 370. 



Polyadelphous, 272. 



Polycotyledony, 377. 



Polyembryony, 302, 377. 



Polypetalous, 271. 



Polysepalous, 270, 330. 



Poppy, 348. 



Potentialities, utilization, 20f-i. 



Preservation of sports. 318, 310. 



Pressure gauge on root, 226. 



Procambium, 265. 



Progeotropic, 247. 



Projection of seeds, 364. 



Proliferations, 201, 367. 



Proliferous Pear, 201 ; Rose, 202- 



Propulsion of water, 148. 



Protection, 261 ; of roots, 232. 



Protein, 104 ; romposition, 27 ; a:^ 

 food for man, 106; grains, 105; 

 kinds, 105 ; layers, 105 ; where 

 made, 27. 



Proteose, 105. 



Prothallus, 306. 



Protoplasm, 30; alveolar structum, 

 38; appearance, 35, 36; char- 

 acteristics, 35 ; chemical compo- 

 sition, 38; composition, 106 

 constitution, 37 ; continuity, 40 

 definition, 8; organization, 40 

 properties, 30 ; streaming, 37 

 texture, 36. 



Protozoa, in soil fertility, 246 ; in 

 soils, 244. 



Pruning. 122, 370; uses, 206. 



Pteridophytes, 11, 



Ptomaines, 109. 



Puffball, 87. 



Quinine, 109. 



Raceme, 336 ; determinate, 336 ; 



indeterminate, 336. 

 Rafflpsia, 84, 86 ; 268. 

 Rainbow Corn, 90. 

 Raphe, 274, 376. 

 Rattan Palm. 113, 184. 

 Receptacle, 193, 271, 275, 351. 

 Recessive, 311. 



Reduction division, 285. 



Redwoods, 113, 115. 



Reflex action, 55. 



Regulation, 39. 



Relative transpiration, 47. 



Reproduction, 265 ; asexual, 29S ; 

 in Fern, 306 ; sexual, 389. 



Resin, 108. 



Respiration, 111, 112, 266; amount, 

 164 ; described, 162 ; in roots, 231 ; 

 i'6'. combustion, 165. 



Respiratory ratio, 162 ; equation, 

 165. 



Respiroscope, 162, 163. 



Resting period, 341, 377, 378; na- 

 ture. 379. 



Reversions, 201. 



Rhizoid, 215, 250. 



Rhizome, of Sedge, 187. 



Rock, pulverized, 238. 



Rockweed, 189, 304 ; sex cells, 304. 



Root, aeration, 258 ; aerial, 253, 254, 

 256, 257 ; anatomy. 220, 222 ; 

 anchorage function, 250 ; cap, 217, 

 221 ; crops, 258 ; cross section, 

 215 ; distinctive features. 212 ; 

 distorted, 257 ; in drains, 248 ; du- 

 ration, 214 ; economics, 257 ; ex- 

 cretions, 243 ; as foliage, 254. 

 255; function, 7; growing point, 

 217, 221 ; growth zone. 218, 221 ; 

 hair, 218, 224; hair in soil, 

 240 : hair zone, 218, 221 ; hairs, 

 use, 225 ; length, 250 ; longi- 

 tudinal section, 219 ; need for 

 air, 258 ; of Orchids, 254 ; origin, 

 223 ; plan of, 225 ; pressure. 

 226 ; protection of. 232 ; prun- 

 ing, 20S ; selective power, 231; 

 self-adjustments, 247 ; shortening, 

 257 ; special functions, 250 ; as 

 spines, 256 ; as storage organs. 

 251; strains, 216; structure, 

 215 ; system, typical, 213 : tip, 

 213.217; tip. diameter, 220; tip. 

 of Radish. 216. 



Rootstock, 187, 188. 



Rose, green, 2(tl, 341; of Jericho. 

 359. 360. 



Rotation of croi>s, 260, ' 



Rots, 367. 



Rubber. 108. 



Riibu.'i squarroiius, 193, 



