INDEX 



525 



Poppy : see Papaver. 

 Portulaca oleracea, 372, 387. 

 Pre-resting seed : use of the term, 18. 

 Prestoea, 327,408,411,413. 

 Prickly Pear : see Opuntia Tuna. 

 Primula veris (Primrose) : 



(a) Seed : permeability, 95 ; hygro- 



scopicity, 164 ; number of seeds 

 per capsule, 500 ; shrinking 

 process, 26, 320, 323 ; coloration, 

 358, 372, 387 ; abortion of ovules, 

 358, 364-367. 



(b) Fruit : drying process, 263, 280, 



284, 320, 323, 326; the drying 

 regime and the requisite data, 

 323, 326 ; dehiscence, 280, 284 ; 

 proportions of pericarp and 

 seeds, 298, 323, 326, 500 ; pro- 

 portional weight of columella, 

 486, 500. 



Proving seeds, 122, 166. 

 Prunus communis : shrinking of seed, 

 26, 320, 501, 502; comparison of 

 fruit with capsules, legumes, etc., 

 260, 361, 272, 318, and with coco- 

 nut, 501 ; drying process, 264, 318, 

 320, 325, 480 ; drying regime, 500- 

 502 ; proportions of pericarp and 

 seed, 297, 300, 325, 328, 501, 502; 

 abortion of ovule, 365. 

 Psidium Guajava (Guava), 297, 325. 

 Punica Granatum, 266. 

 Pyrus Malus (Apple) : 

 (a) Seed : permeability, 95 ; shrinking, 

 26, 239, 320, 324 ; coloration, 

 388. 



(6} Fruit : water-contents and drying 

 process, 183, 264, 320, 324, 325 ; 

 drying regime and the requisite 

 data, 324, 325 ; proportions of 

 pericarp and seeds, 297, 324, 

 325, 502. 



Quercus Robur (Oak) : 



(a) Seed : permeability, 95 ; hygro- 



scopicity, 231 ; water-contents 

 and absorptive capacity, 133, 

 137, 232 ; shrinking process, 26, 

 303 ; transient germinative cap- 

 acity, 418 ; germinating in ice, 

 435 ; failure of ovules, 365, 367. 



(b] Fruit : drying process, 238, 264, 



269, 270, 303, 311, 326, 480, 502 ; 

 data for determining the drying 

 regime, 326, 502 ; water-contents 

 of entire moist fruit, 269, 311 ; 

 and of shell of fresh acorn, 183 ; 



Quercus Robur (Oak) continued. 



proportions of pericarp and seed, 

 298,311, 317, 326. 



(c) Continuation of growth of seed after 



the pericarp has begun to dry, 

 294, 301-303, 309-315, 328, 329. 



(d) Vivipary, 269, 272, 312-315, 328, 



329, 421, 422, 432-436, 439. 



Rape-seed, 108. 



Raphanus, 27, 39. 



Raps, 27. 



Ravenala madagascariensis : 



(a) Seed : permeability, 95 ; hygro- 

 scopicity, 164 ; shrinking pro- 

 cess, 26, 321 ; proportions of 

 coats and kernel, 190, 408 ; aril, 

 I 3> 37; embryo, 408; failure 

 of seeds, 283, 359, 364, 365. 

 (o) Fruit : description, 282, 284 ; dry- 

 ing process, 263, 283, 284, 318, 

 321, 325, 502 ; drying regime 

 and the requisite data, 283, 325 ; 

 dehiscence, 282, 283 ; propor- 

 tions of pericarp and seeds, 297, 

 502. 



Red seeds, 369, 395-400, 402. 

 Rendle, 504. 

 Replum, 354, 494. 

 Reproduction, vegetative, 446, 448, 459, 



506-508. 



Rest-period : general treatment, 417- 

 439 ; its impress on the germinating 

 seed, 204, 222. 

 Retrogression of plants, 445, 446, 448, 



449-453, 487, 488. 

 Reversibility, Berthelot's principle of, 



149, 177- 

 Rhamneae, 487. 

 Rhizophora, 424, 426, 438. 

 Rhus, 508. 



Ribes Grossularia (Gooseberry) : shrink- 

 ing process of seeds, 26, 41, 320; 

 permeability, 95 ; water-contents 

 of fruit, 258 ; drying of fruit, 264, 

 320, 325, 477, 502 ; effect of sugars 

 on drying, 266, 477 ; proportions of 

 pericarp and seeds, 297, 300, 477 ; 

 fruit compared with that of Barring- 

 tonia speciosa, 258. 

 Rice : behaviour after heating, 489. 

 Ricinus communis : 



(a) Seed : permeability, 95 ; hygro- 

 scopicity, 164, 236, 493 ; water- 

 contents and absorptive capacity, 

 137, 215 ; swelling process, 26, 

 34, 38, 53, 201, 208, 211, 214, 218, 



