SUBJECT INDEX 



685 



Electrolytes, effect of — Continued 



on surface tension, 26 

 Electro-osmosis, 104, 136 

 Electrophoresis, 46-47 

 Elements in plants, 401-403 



essential and non-essential, 417-420 

 Emulsifiers, 2>1>, 37-38 

 Emulsin, 381, 466, 468, 470-47I 

 Emulsions, 3,3,, 34> 36-38 

 Endodermis, 157, 270, 271, 274-275, 



482 

 Endoenzymes, 463, 477 

 Endosperm, 478-479, 625, 626 

 Energy release during respiration, 



511-513 

 Enlargement (elongation) phase of 



growth, 269, 555-557 



Enzymatic activity, factors affecting, 

 472-476 



Enzymes, 



chemical nature of, 477 

 general nature, 462-463 

 production of by plants, 477-479 

 properties of, 464-467 

 synthetic action of, 395, 472 



Enzymes, hydrolytic, 



classification of, 463-464 

 occurrence in plants, 468-472 



Enzymes, oxidizing-reducing, 531- 



536 

 Ephemerals, 299 

 Epicotyl, 628 



Epinasty, 610, 611, 654, 665 

 Erepsins, 472 

 Ergosterol, 396 

 Essential oils, 399 

 Essential plant elements, 417-420 

 Esterases, 471 

 Esters, 390 

 Ethyl alcohol, 121, 537-538, 540, 



541, 542, 544 

 Ethylene, effect on growth, 610-611 

 Ethylene dichlorid, 640 

 Etiolation, 597-598 

 Evaporation, 159-160 



in relation to transpiration, 157- 



158 



Evaporation — Continued 



measurement of, 1 60-1 61 

 Exoenzymes, 463, 477-479 

 Exudation from phloem, 500-501 

 Exudation from xylem, 171, 231-232 



Fats, 71, 72, 390 



oxidation of, 510, 518-519 



storage of, 570 



synthesis of, 392-395 

 Fatty acids, 391-392 



permeability of cytoplasmic mem- 

 branes to, 122 

 Fermentation, alcoholic, 536-538 



relation to anaerobic respiration, 



540-541 



Fibrils in cell walls, 67-68 



Field capacity, 253-255, 261-262 



Filterability of sols, 40-41 



Flavone, 382, 385 



Flocculation of sols, 48-54 



Florigen, 583, 606 



Fluorescence of chlorophyll, 308, 311 



Foods, 417 



Formaldehyde theory of photosynthe- 

 sis, 331-332 



Freezing injury, 592, 593 



Freezing point depression, relation to 

 osmotic pressure, 103-104 



Fructose, 321-322, 372-373, 543 



Fumaric acid, 442, 535 



Funiculus, 625 



Galactose, 372 



Gas pressure, analogies with osmotic 



pressure, 99-102 

 Gay-Lussac's law, lOi 

 Gelation, 



of cytoplasm, 74 



of sols, 55-56 

 Gels, 54-58 



Genetic constitution, role in plant de- 

 velopment, 585-586 

 Gentianose, 374 

 Geotropism, 660-662 

 Germination of seeds, 626-631 

 Girdling, see ringing 

 Glands, 171 



