INDEX 



499 



Heat-rigor, 231, 239. 



Hedgehog, hydrocyanic acid, 19. 



HEGLER, pulling and growth, 372, 374; 

 electrotropism, 412. 



HEIDENSCHILD, toxic proteids, 22. 



Helianthus, pulling, 374 ; phototro- 

 pism, 438 ; phototropic angle, 471. 



HELLRIEGEL, nitrogen fixation, 310. 



HELMHOLTZ, light on retina, 171. 



Hen, mineral matter in egg, 303 ; flu- 

 orine, 317. 



HENSEN, light and pelagic eggs, 417. 



Hepatics, thigmotropism, 381. 



HER.EUS, nutrition, 300. 



Herbivora, chlorine, 316. 



HERBST, salts of marine animals, 303 ; 

 phosphorus and growth, 314 ; sul- 

 phur, 315 ; chlorine, 316 , potassium, 

 319 ; magnesium, 323. 



HERMANN, electrical measurements, 

 128 ; electric stimulation, 139 ; elec- 

 trotaxis, 147-149 ; cold, 242. 



HERRICK, gravity and nucleus, 114 ; 

 temperature and growth, 458. 



HERTWIG, O., growth of frogs, 458, 459. 



HERTWIG, O. and R., cocaine, 24 ; 

 strychnin, 25 ; quinine, 26 ; chemo- 

 taxis, 33. 



HIEROXYMUS, chlorophyll movements, 

 191. 



HIGGENBOTTOM, light and growth, 425. 



HILTNER, nitrogen and growth, 312. 



HOFER, hydroxylamine, 15. 



HOFFMAXX. water and growth, 250 ; 

 dryness and resistance to heat, 255 ; 

 light and germination, 420, 424. 



HOFMEISTER, molar agents and proto- 

 plasm, 100, 102 ; phototaxis, 184 ; 

 temperature and protoplasm, 225 ; 

 heat-rigor, 232 ; geotropism, 401. 



Holothuroidea, geotaxis, 118. 



Honey bee, temperature and metab- 

 olism, 223. 



HOPPE-SEYLER, acclimatization to heat, 

 251 ; lithium on growth, 318 ; mag- 

 nesium, 323. 



HORVATH, shaking protoplasm, 99 ; bro- 

 mine and growth, 316 ; rough move- 

 ment on growth, 370. 



HUDSON, desiccation, 63. 



Human embryo, water in growth, 286. 



Humidity of soil and growth, 253. 



HUXLEY, definition of growth, 282. 



Hydra, nicotin, 23 ; density, 81, 86 ; 



phototaxis, 194, 202 ; light waves 



and growth, 430. 

 Hydrachna, maximum temperature, 



238. 



Hydrazin and protoplasm, 16. 

 Hydric sulphide, protoplasm, 19, 20. 

 Hydrides, chemotactic, 37. 

 Hydrocyanic acid, poison, 19. 

 Hydrogen on protoplasm, 5 ; in organ- 

 isms, 306. 



Hydrogen peroxide, poison, 3. 

 Hydroidea, inorganic food, 303 ; iron, 



323 ; density and regeneration, 364 ; 



thigmotropism, 382 ; geotropism, 398, 



399 ; phototropism, 443. 

 Hydroides dianthus, responds to 



shadow, 179. 

 Hydrotaxis, 66. 

 Hydrotropism, 255. 

 Hydroxylamine, poison, 1, 15. 

 Hyphae, chemotropism, 340 ; hydro- 



tropism, 358. 



Hypochlorous acid, poison, 3, 4. 

 Hypozanthin, chemotactic stimulus, 



38. 



Indifferent chemical agents and proto- 

 plasm, 41, 42. 



Induction apparatus, 127. 



Infusoria, and potassic permanganate, 

 4 ; halogens, 4 ; arsenious acid salts, 

 5; azoimid, 7; chloral hydrate, 10; 

 hydroxylamine, 15 ; phenylhydrazin, 

 16 ; hydrocyanic acid. 19 ; ethylakle- 

 hyde, 21; quinine, 27 ; acclimatiza- 

 tion, 28; chemotaxis, 33; thigmotaxis, 

 106 ; katex response, 137 ; electro- 

 taxis, 140; wave-lengths which dis- 

 turb metabolism, 170; heat and 

 movement, 228; cold-rigor, 240; or- 

 ganic foods, 328 ; multiplication and 

 light, 422. 



Injurious substances, response to, 39. 



Inorganic salts and protoplasm, 37. 



Insecta, hatching and temperature, 458. 



Insectivorous plants, chemotropism, 

 335. 



Invertebrates, quinine, 26 ; sodic car- 

 bonate, 28; water in, 58, 59; elec- 

 tric response, 136 ; electrotaxis, 147 ; 

 ultramaximum temperatures, 234- 

 237 ; ultraminimum, 244-246 ; in hot 



