54 2 



A History of Botany, 1860-1900 



Osmotaxis, 487. 



Osmotic pressure, range of, 254. 



Ovule, morphology of, 93. 



— development of, 98. 

 Oxalate, calcic, formation of, 353. 

 Oxychromatin, 180. 



Pacytheca, 141. 



Palaeostachya, 142. 



Papain, 410. 



Papaw tree, enzyme of, 376. 



Paraheliotropism, 451, 465. 



Parasitism, 435. 



Parthenogenesis, 109. 



Pecopterideae, 149. 



Pectoses, 187, 189. 



Pepsin, 409. 



Pericambium, 216. 



Periclinal, 193. 



Pericycle, 216. 



Periderm, 215. 



Perimedullary zone of Flot, 211. 



Peristem, 200. 



Phleoterma, 211. 



Phloem, internal, 220. 



Photo-epinasty, 457. 



Photomechanical induction, 498. 



Photosynthesis, theories of, 301. 



— inhibition of, 321. 

 Phototaxis, 469. 

 Phototonus, 457. 

 Phyllocyanin, 293. 

 PhyHoglossum, 239. 

 Phyllome, 66, 67. 

 Phyllopodium, 73. 

 Phylloporphyrin, 294. 

 Phyllosiphonic stele, 122, 214. 

 Phylloxanthin, 293. 



— iron in, 365. 

 Phyto-actinometer, 322. 

 Pihdaria, 237, 238. 

 Pinguicula, 440, 483, 484. 

 Pinites, 152. 



Pitcher plants, 437. 



Placenta, morphology of, 97. 



Plagiotropic, 445. 



Plasma membranes, 174, 252, 255. 



Plasmolysis, 254. 



Plastids, independent action of, 297 



Pollen tube, homologies of, 98. 



— nuclei in, 98. 



— growth of, 106. 

 Polyembryony, 108. 

 Polystely, 210. 



Poroxyleae, 136, 150. 



Pothocites, 142. 



Protein, theories of construction of, 



35 1 , 353- , „ 



Protein, labile, 416, 418. 

 Proteoclasis, 409. 

 Proteosomes, 417. 

 Prothallus of Angiosperms, 101. 



— of Gymnosperms, 102. 



— of Pteridophyta, 235. 

 Protophyllin, 295. 

 Protophyt, 48. 

 Protopiiys, 148. 

 Protoplasm, 167. 



— continuity of, 175. 

 Protostelic, 213. 

 Prototaxites , 140. 

 Psilotttm, 239. 



Pulvini, mechanism of, 480. 

 Pyrrol, 294. 



Rachiopteris, 147. 



Raffinase, 408. 



Rand, 385. 



Rectipetality, 445. 



Reduction divisions, 61, 182. 



Reserve materials, 379. 



Resin ducts, 225. 



Respiration, 419 ; intramolecular. 



426. 

 Respiratory quotient, 421. 

 Rhamnase, 408. 

 Rheotropism, 487. 

 Rhythm, 448, 453, 454. 

 Riccia, 232. 

 Root-pressure, 256. 



— periodicity of, 257. 

 Roots, corrosive action of, 255. 



— lateral, 223. 



— sensitiveness of, 479. 



— selective power of, 247. 

 Rotation, movement of, 456. 



Salvinia, 237. 

 Saprophytes, 435. 

 Sarracenia, 437. 

 Schizostely, 211. 

 Schleimschicht, 33. 

 Seismotropism, 488. 

 Selaginella, 239, 240. 

 Seminase, 406. 

 Sieve-tubes in Algae, 227. 

 Sigillaria, 135, 145, 146. 

 Siphonostely, 213. 



