INDEX 



379 



Respiration, pigments, 271-272 

 relation to fermentation, 269-275 

 role and nature, 248-251 

 substances consumed in, 253- 

 255 

 Rest period, 288-293 



of seeds, 294-295 

 Reversibility of enzyme action, 213- 



214 

 Ricca, on seismonastic sensitivity, 



341 

 Ringer, on toxic effects of single 



salts, 75 

 Robertson, on growth formula, 283- 



284 

 Root, hairs, 144-145 

 pressure, 136-139 



osmotic mechanism of, 139-143 

 suction tension and exudation 



pressure of, 136-139 

 systems, 133 

 Roots, dissolving action of, 78-79 

 Rothert, on phototropism, 317 

 Rotmistrov, on root systems, 132 

 Russel, on mineral nutrition, 87 



S 

 Sabinin, on composition of sap, 153 



on permeability of cells, 118 



on root pressure, 139 

 Saccharophylous plants, 15 

 Sachs, on accumulation of dry mat- 

 ter, 31 



on carbon assimilation, 12-13 



on "flower-forming substance," 351 



on geotropism, 323 



on growth, 280-281 



on principal elements in nutrition, 

 67 



on root absorption, 78 



on "root-forming substance," 362 



on starch test, 15 



on time of blooming, 351-352 



on water absorption, 147 



on water relations, 145 

 Saponification, of fats, 215 

 Saprophytes, nutrition of, 231-236 

 Schulov, on root excretion, 79 



Schulze, on asparagine, 226 

 Schwendener, on transpiration, 155 

 Scion and stock, reciprocal effect of, 



364, 365 

 Sclerophylous zerophytes, 176 

 Seed, germination, 293-297 

 after ripening, 294 

 stratification, 294 

 storage of substances in, 199-202 

 Seismonastic movements, 336-341 

 Semiparasites, 237-238 

 Semipermeable membranes, 110-111 

 Senebier, on selective absorption, 



33 

 Sensitivity of plants, 312-341 

 Shade plants, 39 

 Shive and Tottingham, on nutrient 



solution, 8 

 "Sleep" of plants, 337-338 

 Soil, aeration, 149 

 analysis, 80 



fertility, methods of determining, 

 80-84 

 by field experiments, 80-84 

 by pot experiments, 80-84 

 toxins, 149 



water-retaining force of, 143-147 

 Solutions, balanced, 74-76 

 Specificity of enzymes, 213, 214 

 Starch, 202-204 

 formation of, 14 

 grains in chloroplasts, 14 

 stages in digestion of, 207 

 Statoliths, 327 

 Sterile cultures of higher plants, 52- 



53, 79 

 Stimulants, chemical, on growth, 



307-311 

 Stomata, diurnal movements of, 169 

 Stomatal movements, methods of 



study of, 165-170 

 Strasbtjrger, on water transloca- 

 tion, 195 

 Stratification of seeds, 294 

 Stroma, of chloroplasts, 18 

 Succulent plants, 174 

 Sucrose, 205 

 Suction tension, 132-136 



