624 



INDEX 



bleeding of branches of, 254 ; green 

 cotyledons of, 333 ; root-system of, 153. 



Pisonia alba, 334. 



Pistia texensis, 182. 



Pistone de Regibus, 475. 



Ptsum, 171, 181, 206, 464; cotyledons of, 

 596; P. sativum, 400; intramolecular 

 respiration of, 537 ; self-depletion of 

 cotyledons of, 599. 



Pitra, 258,259,266,369; bleeding of isolated 

 stems, 254. 



Pitruschky, 490. 



Pitsch, 392, 404. 



Plant organs, structure and function of, 37. 



Planta, Von, 284, 600, 604. 



Plantago, translocation in bundle-sheaths 



of, 575- 



Plasmatic membranes, importance of, in 

 diosmosis, 92, 93 ; characters of, 107-9. 



organs, origin of, 46, sec. 8. 



Plasiiwdiophora, 112; P. brassicat, 377. 



Plasmolysis, naturally produced, 143; theo- 

 retical importance of, 135; origin of 

 term, 143. 



Plasmolytic tests, for permeability, 98. 



Plastic substances, 445. 



Plastids, 43. 



Plastin, 65, 66. 



Pleon, 77. 



Pneumathodes, 189. 



Poa artnua, root-hair of, 151, Fig. n. 



Podocarpits, assimilation of free nitrogen 



by, 397- 

 Poiret, 306. 

 Poisons, 498, sec. 89 ; function of, 499 ; j 



influence of, on respiration, 563 ; sup- 

 pression of formation of, 491. 

 Polacci, 428. 



Pollen grains, reserve-materials of, 604. 

 Polstorff, 418. 

 Polygala, 369. 

 Polyporus, 276 ; P. applanatus, 377 ; /'. 



destructor, 536 ; P. sulp/tureus, enzyme 



of, 509. 

 Polytrichum jiiniperinum, rhizoid of, 151, 



Fig. ii. 



Pontederia, 205. 

 Popoff, 66, 509. 

 Populin, 457, 494. 

 Populus, 243 ; P. canadensis, 265. 

 Porous cork, 198. 

 Porteau, 227. 

 Portele, 60 1. 

 Portes, 494, 602. 

 Positive pressure of intercellular air, causes 



of, 203, 204 ; demonstration of, 204, 



Fig. 25. 



Potamogeton, 132, 309. 

 Potassium, essential character of, 411, 429; 



functions of, 430. 



myronate, 494. 



salts, importance of, in maintenance of 

 turgor, 424. 



Potato, percentage of amides in, 459. 



Potometer, 242, Fig. 30. 



Pott, 586. 



Pouillet, radiant energy of sunlight, 347. 



Poulsen, 284. 



Prael, 484. 



Prantl, 473, 594, 604. 



Prazmowski, 397-402, 558. 



Precipitates in living cells, 96. 



Precipitation membranes, 106 ; modifica- 

 tions in permeability of, 106. 



Preyer, 36. 



Prianischnikow, 338, 409, 433, 461,464-6, 

 600. 



Priestley, 308. 



Prillieux, 352. 



Primordial utricle, 91. 



Primula, 474; P. sinensts, 218. 



Pringsheim, 305-8, 320, 321, 334-6, 539; 

 incrustation on Chara, 133 ; cellulose 

 granules, 483 ; erroneous hypothesis of, 

 563; hypochlorin, 317; improper use 

 of bacterium method by, 351 ; influence 

 of anaesthetics on photosynthesis, 339 ; 

 permeability of precipitation mem- 

 branes, 106; protective theory of chloro- 

 phyll, 341, 342, 355. 



Prismatic spectrum, use of, 351. 



Propionic acid, production of, by acetic 

 bacteria, 560. 



Propyl-alcohol, fermentation of, 560. 



Propylamine, nutritive value of, for fungi, 



384. 



P rote a me/lifera, 285. 



Proteid, living, changes in on death, 66; 

 decomposition of, 463 ; in respira- 

 tion, 544 ; - historical account of, 

 468 ; percentage composition pf, 67 ; 

 synthesis of, 409. 



Proteolytic ferments, 508. 



Proteus vulgaris, 532. 



Protochlorophyll, 316. 



Protoplasm, proteids of, 460; structure of, 

 42, sec. 7. 



Protoplasmic continuity, 113-5. 



Proust, 451. 



Prove, 497. 



Prunella grandiflora, influence of darkness 

 on development of flower of, 497. 



Prunet, 604. 



Prunus, 335 ; P. cerasus, 259 ; bleeding of 

 branches of, 254; P. laurocerasus, 

 118, 1 86, 282, 283, 286; P.padus, 602. 



Prussic acid, evolution of, 391. 



Psamma arenaria, 430. 



Ptomaines, 498, sec. 89. 



Pulmonaria, changes of colour in cell-sap 

 of, 98 ; in flower of, 490. 



Puriewitsch, 98, 102 ; depletion of endo- 

 sperm, 515, 590, 591, 598 ; of cotyle- 

 dons, 599 ; influence of concentration 

 on, 5 17; exosmosis of albumin during, 

 95 ; foamy structure of protoplasm. 44 ; 



