554 



INDEX 



.Respiration, 259. 



analytical researches on, 277. 



and growth, 394. 



influence of external conditions 

 on, 270. 



intramolecular, 262, 264. 



normal, 269. 

 .Respiratory apparatus, 264. 



ratio, 278. 

 Rheotropic behaviour of plasmodia, 



434. 



.Rigidity of plant organs, 518. 

 Rigor, cold, 541. 



darkness, 529, 535. 



dryness, 541. 



heat, 541. 

 Ringing, 225. 



Ripening of fruits and seeds, 318. 

 Root hairs, 237. 



pressure, 197. 



pressure, causes of, 205. 



pressure, influence of external 

 conditions on, 200. 



pressure, periodicity of, 204. 



tip, function of, in geotropic 



nutations, 452. 

 Roots, absorption of water by, 185. 



as organs for the absorption of 

 mineral substances, 237. 



contraction of, 366. 



Sand as a culture medium, 62. 

 Sap, escape of, from plants, 206. 



escape of, from tree trunks, 208. 



flow of, from injured trees, 199. 

 Saprophytic fungi, 94. 

 Saussure's law, 240. 

 Sawdust as a culture medium, 2. 

 Sclerenchyma, 518. 

 Scutellum of grasses, 314. 

 Seed coat, structure of, 191. 

 Sieve tubes, 356. 

 Silicon not an essential constituent 



of the food of plants, 82. 

 Silicon skeleton, 83. 

 Silver solution, alkaline, 118. 

 Smallest surfaces, principle of, 373. 

 Snails and plants, 344. 

 Sodium, not an essential constituent 



of plant food, 82. 

 Soil, constituents of, 77. 



Soil, mechanical analysis of, 77. 

 Somatotropic nutation, 478. 

 Spectral apparatus, 22. 

 Spectrum, objective, 469. 

 Spongy parenchyma of leaves, 11. 

 Starch, as a product of assimilation, 

 46. 



as reserve material, 293. 



determination of, 294. 



-forming corpuscles, 120. 



grains, 112. 



grains, behaviour of, in polar- 

 ised light, 115. 



grains, behaviour of, towards 

 Iodine, 114. 



macroscopic detection of, 45. 



microscopic detection of, 45. 



sheath, 355. 

 Starchy trees, 350. 

 Stereides, 518. 

 Stereome, 518. 

 Sterilisation, 97. 

 Stomata, 168. 



influence of induction currents 

 upon, 172. 



opening and closing movements 

 of, 171. 



and assimilation, 56. 



and transpiration, 213. 

 Stoves, 201. 



Sugar as a product of assimilation, 

 47. 



-cane, tests for, 302. 



formation of, in potatoes, 317. 



sheath, 356 



varieties of, 300. 

 Sulphur as food, 84. 

 Symbiosis of Hydra with Algse, 17. 



Tannic acid, 333. 



detection of, 333. 



Tannin, quantitative determina- 

 tion of, 334. 



Temperature, high, influence of, on 

 plants, 128. 



low, influence of, on plants, 123. 



of plants, 155. 

 Tendrils of the Ampelidese, 501. 



of the Cucurbitacese, 496. 

 Tension, longitudinal, 368. 



transverse. 370. 



