504 



INDEX 



Phosphorus, and growth, 313. 



Photopathy, 180 ; distribution, 182 ; 

 laws of, 196 ; and chemical constitu- 

 tion of medium, 201. 



Phototaxis, 180, 195 ; true and false, 

 181 ; distribution, 182 ; effect on P. 

 of strong light, 196 ; laws of, 196 ; 

 effective rays, 201; P. us. photo- 

 pathy, 203. 



Phototonus, 177. 



Phototropism, 437, 438 ; optimum in- 

 tensity in, 439 ; effective rays, 443 ; 

 mechanics of, 444 ; limiting angle, 

 471, 472 ; after-effect, 484. 



Phy corny ces, water and spores, 358; 

 heat and growth, 464. 



PICKFORD, heat-rigor, 231. 



PICTET, cold-rigor, 240. 



Pigeon, acclimatization to poison, 29. 



Pigs, food of growing, 330. 



Planaria, azoimid, 7 ; hydroxylamine, 

 15 ; density, 81 ; thigmotaxis, 105 ; 

 photopathy, 206. 



Planorbis, azoimid, 7 ; density, 85. 



Plastic foods, 293. 



PLATEAU, density, 80-82, 86 ; absorp- 

 tion of salt, 88. 



PLATT, geotaxis, 124. 



Poa, light on seeds, 424. 



Poisons, oxidizing, 3, 49 ; catalytic, 7, 

 50; salt-forming, 12, 50; substitu- 

 tion, 15, 50 ; acclimatization to, 29. 



POLECK, silicon in hen's egg, 324. 



Pollen-tubes, chemotropism, 337, 338 ; 

 hydrotropism, 358. 



Polygordius, phototaxis, 200. 



Polyphemus, density effect, 76. 



Polystoma, salt-absorption in, 89. 



Polystomella, electric stimulus, 129. 



Polytrichum, light and germination, 

 424. 



Porthesia, thermotaxis, 261. 



Potassium, growth, 318 ; regeneration, 

 319. 



Potassium salts, poisons, 4, 5. 



POUCHET, light-stimulus, 179. 



Preissia, light and germination, 424. 



PRESCH, sulphur and growth, 315. 



PREYER, anabiosis, 61, 63. 



PRINGSHEIM, light on green plants, 

 174 ; light-rigor, 178. 



Propionic acid, 38. 



PROSHER, growth of mammals, 330, 331. 



Protein poison compounds, 22. 



Protista, cocaine, 24 ; morphine, 25 ; 

 desiccation, 64; contact response, 99 ; 

 geotaxis, 114, 115, 118, 121-123; 

 electric stimulus, 134 ; acclimatiza- 

 tion to electricity, 139 ; electrotaxis, 

 146 ; photopathy and phototaxis, 

 182, 203; heat, 224, 228; thermo- 

 taxis, 258, 261 ; growth of P. and 

 light, 416. 



Protoplasm, hydroxylamine, 1 ; oxy- 

 gen, 2, 3 ; substitution poisons, 15 ; 

 nicotin, 23 ; strychnin, 25 ; quinine, 

 26 ; antipyrin, 27 ; acclimatization 

 to poisons, 32 ; specific resistance of, 

 49 ; structure of, 70 ; varying den- 

 sity, 74 ; acclimatization to change 

 of density, 86 ; contact, 97 ; periodic 

 disturbances, 98 ; electric stimulus, 

 138; temperature, 241; chemical 

 agents and growth, 274 ; structure 

 and composition, 274, 275; struct- 

 ural limiting conditions, 276. 



Pseudophototaxis, 181, 182. 



PUGH, free nitrogen, 310. 



Pulmonates, fresh-water, varying den- 

 sity, 78. 



PURIEWITSCH, free nitrogen, 308. 



PURKINJE, cold, 241. 



Pyrocatechin, poison, 19. 



QUINCKE, effect of blue rays on growth, 



436. 

 Quinine on protoplasm, 26, 27. 



Rabbit, acclimatization to snake poi- 

 sons, 30. 



RACIBORSKI, growth and density, 363. 



Radiant heat and growth, 463. 



Radiolaria and silicon, 324. 



RAILLET, desiccation-rigor, 61. 



Rana, heat and growth, 457-459. 



RAUBER, oxygen on frog's eggs, 305; 

 temperature and growth, 459. 



RAULIN, phosphorus and growth, 314. 



RAY, gravity and growth, 391. 



RAYLEIGH, monochromatic light, 158. 



Regeneration and potassium, 319; 

 density, 364, 365. 



REINHARDT, chemotropism, 340. 



REINKE, light and plant assimilation, 

 167 ; moisture and growth, 251 ; 

 agitation of water and growth, 371. 



