606 



INDEX 



Sea-urchin, inorganic food, 303. 



Secretion, contact stimulus, 99. 



Seed, vitality, 64 ; pliosphorus in, 303 

 liglit on germination, 419, 422. 



Seedling, oxygen and growth, 305 

 ether and growth, 333 ; pulling stim 

 ulus, 372, 373 ; rheotropism, 387 

 electricity and growth, 405-410. 



Selenous oxide and Spirogyra, 20. 



Semper, extent of medium on size of 

 snails and fish, 474. 



Sensitive plant, light on growtli, 429 ; 

 temperature and growth, 458. 



Sepolia, nicotin, 24. 



Serpula uncinata, sudden change of 

 intensity, 179. 



Serpulidse, phototropism , 442. 



Sewall, acclimatization to poison, 29. 



Sexual cells, cocaine, 24 ; quinine, 26. 



Sheep, food of growing, 330. 



Shuttle-worth, acclimatization to 

 cold, 257. 



Silkworm, cold- rigor in eggs, 240. 



Silicon and growth, 3i!4. 



Sinapis, phototropic, 438. 



Slug, thigmotaxis, 105. 



Snails, strychnin, 26 ; extent of me- 

 dium on size, 474, 475. 



SociN, iron and growth, 323. 



Sodium, salts on protoplasm, 4, 21, 22; 

 and growth, 318. 



Solutions, physical action of, 70. 



SoROKiN, phototonus, 177. 



Spallanzani, desiccation-rigor in roti- 

 fers, 61, 63. 



Spaulding, false and true thigmotro- 

 pism, 384, 385. 



Specific rate of vibration, 98. 



Spectrophor, Reinke's, 156. 



Spectrophotometer, 160. 



Spermatozoa, chemotaxis, 37 ; thigmo- 

 taxis, 106, 107. 



Spermatozoids, chemotaxis, 33. 



Spirillum, chemotaxis, 33. 



Spirographis, sudden change of light, 

 179. 



Spirogyra, ammonia, 6 ; salts of heavy 

 metals, 14 ; selenous oxide, 20 ; 

 formaldehyde, 21 ; phosphorus on 

 growth of, 314 ; effective rays in 

 growth, 430. 



Sponge, silicon and growth, 324. 



Sponge gemmules, 65. 



Spores, desiccation of, 65 ; heat, 256 ; 

 chemotropism, 341 ; light and germi- 

 nation, 419, 422, 424 ; heat and ger- 

 mination, 452. 



Squid, copper in blood of, 324. 



Stahl, chemotaxis, 33, 38, 45 ; hydro- 

 taxis, 66 ; acclimatization to changed 

 density, 86 ; tonotaxis, 89 ; rheotaxis, 

 108 ; light and chlorophyll arrange- 

 ment, 181, 191 ; phototaxis, 183- 

 185 ; thermotaxis, 250. 



Stameroff, light and growth, 420. 



Standee. See Klinger. 



Stance, chemotaxis, 33-38 ; growth 

 and density, 362. 



Starfish, geotaxis, 118 ; phototaxis, 202 ; 

 inorganic food and gxowth, 303. 



Statoblasts, changing temperature 

 necessary to development of, 425. 



Stebler, light and germination, 424. 



Stefanowska, light response of pig- 

 ment, 193. 



Steinach, direct action of light on iris 

 movements, 179 ; light response of 

 pigment, 192. 



Stems, hydrotropism, 358 ; gravity on 

 growtli, 397 ; curvature, 398 ; day- 

 light and growth, 419. 



Stentor, salts as poisons, 15 ; accli- 

 matization, 30, 31 ; photopathy, 189 ; 

 thigmotropism, 375. 



Stimulus, relation between intensity 

 and response, 39, 40. 



Stoklasa, free nitrogen and plants, 

 312. 



Stolons, geotropism, 400 ; phototro- 

 pism, 443. 



Strasburgkr, rheotaxis, 108 ; light- 

 response, 179 ; phototaxis, 183, 184, 

 199, 202, 208 ; light and temperature 

 on locomotion, 199 ; temperature and 

 irritability, 230 ; high temperature, 

 239 ; acclimatization to cold, 257 ; 

 chemotropism, 337. 



Strongylus ruf escens, desiocation-rigor, 

 61. 



Strontium, growth, 321. 



Structure of protoplasm, 70. 



Strychnin, 25, 26. 



Sugar, attracts Bacterium termo, 37. 



Sulphonal, 10. 



Sulphur, on growth, 314 ; oxide and 

 growth, 20. 



