INDEX 



503 



NIEPCE DE SAINT VICTOR, chemical 

 action of light on starch, 165. 



NIKOLSKI, curare and protoplasm, 26. 



Nitella, cold-rigor, 241. 



Nitrogen, source of, in organisms, 307 ; 

 free N. as food, 308, 313. 



Nitrogenous compounds, as poisons, 

 16-21 ; chemotactic, 38. 



Nitrous acids, and protoplasm, 21. 



NOBBE, free nitrogen as plant food, 

 312 ; potassium as food, 319. 



Noctiluca, effect of paraldehyde, 21 ; 

 formaldehyde, 21 ; antipyrin, 27 ; 

 deformation, 98. 



Nuclein, composition, 298. 



Nutritive solutions, for algae, 302 ; for 

 fungi, 302 ; light and seed germina- 

 tion, 420. 



Nutritive values, laws of, 325. 



OGATA, food of Infusoria, 328. 



OHLMULLER, ozone and bacteria, 3. 



OLTMANNS, phototaxis, 183, 205, 206. 



ONIMUS, penetrability of tissues by 

 light, 165. 



Optimum, 40 ; change of, 254 ; con- 

 centration for growth, 364 ; move- 

 ment for growth, 372 ; temperature 

 for growth, 454-456, 460, 461. 



Orbitolites, molar agents, 100 ; thig- 

 motaxis, 106 ; thigmotropism, 376. 



Organic, compounds chemotactic, 37 ; 

 food used in growth, 324 ; food, 

 election of, 333. 



Organisms, atomic composition of dry 

 substance, 296 ; elements important 

 for, 297, 298 ; food of non-chloro- 

 phyllaceous O. , 299. 



Oscillaria, phototaxis, 184. 



Osmosis, rdle in organic life, 71 ; 

 quantitative measure of, 71-73. 



Osmotic index, 82. 



Ostracoda, azoimid, 7. 



Ostrea, acclimatization to changed 

 density, 85. 



OSTWALD, temperature and osmosis, 

 83 ; electrical methods, 126. 



OVERTON, chemotropism, 242. 



Oxygen, effect on anaerobic bacteria, 2 ; 

 on protoplasm, 2-5 ; antipyrin, 27 ; 

 chemotactic, 34 ; thigmotactic, 106 ; 

 as food, 304 ; and growth, 305. 



Ozone, and bacteria, 3. 



Palsemon, nicotin, 24. 



PALM, cause of twining, 377. 



Paludina, changing density, 85. 



PANETH, hydrogen peroxide and Cili- 

 ata, 3. 



Paraldehyde, protoplasm, 21. 



Paramecium, strychnin, 26 ; electro- 

 taxis, 142, 144, 145; change of 

 optimum, 254 ; thermotaxis, 259, 

 260. 



Parasites, oxygen, 2. 



PARKER, response of pigment to light, 

 193. 



PASTEUR, ultramaximum of dry spores, 

 255. 



Patella, acclimated to diminished tem- 

 perature. 85. 



Pathogenic bacteria, chemotaxis, 33. 



PEIRCE, twining in dodder, 377. 



Pelias berus, rabbits acclimated to 

 poison of, 30. 



Pelomyxa, electric stimulus, 129, 133^ 

 134. 



Penicillium, fixes free nitrogen, 308. 



Peptone, chemotactic, 38. 



Peranema, electric response, 130. 



Perceptive region, in phototropism,, 

 441. 



PERKINS, gravity and Limax, 118-120. 



Permanganic acid, poison, 3, 4. 



Peronospora, does not germinate in 

 light, 420. 



PETERMANN, free nitrogen as plant 

 food, 312. 



PFEFFER, chemotaxis, 33, 36-45 ;. 

 measure of osmosis, 71 ; tonotaxis, 

 89, 90 ; thigmotaxis, 100, 108 ; wave- 

 length active in assimilation, 166; 

 growth, 281 ; election of food, 333 ; 

 chemotropism, 337 ; method of iso- 

 lating the root tip, 395 ; cause of 

 twining, 377 ; irritable period in 

 thigmotaxis, 379 ; contact stimulus, 

 382, 383, 386. 



PFEIFFER, free nitrogen and plants, 

 312. 



Phanerogamia, free nitrogen as food, 

 312 ; potassium, 318 ; calcium, 320 ;. 

 electrotropism, 411 ; red rays and 

 growth, 436. 



Phenol, as poison, 18. 



Phenylhydrazin, poison, 16. 



Phosphorescence, 98. 



