INDEX 



503 



NIEPCE DP. SAIVT VICTOR, chemical 

 action of light on starch, 1(55. 



NIKOLSKI, curare and protoplasm, 26. 



Nitella, cold-rigor, 241. 



Nitrogen, source of, in organisms, 307 ; 

 free N. as food, 808, 813. 



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, r61e 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. 



Palasmon, nicotin, 24. 



PALM, cause of twining, 377. 



Paludina, changing density, 85. 



PANETH, hydrogen peroxide and Cili- 

 ata, '}. 



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. 



PETERMAXX, free nitrogen as plant 

 food, 312. 



PFEFFER, chemotaxis, 33, 36-45 ; 

 measure of osmosis, 71 ; tonotaxis, 

 89, 90 ; thigmotaxis, 10(5, 108 ; wave- 

 length active in assimilation, 166 ; 

 growth, 281 ; election of food, 333 ; 

 chemotropisra, 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 j red rays and 

 growth, 436. 



Phenol, as poison, 18. 



Phenylhydrazin, poison, 16. 



Phosphorescence, 98. 



