SUBJECT INDEX 



Abscission, 649-651 



Absorption of electrolytes (mineral 



salts), 407-412 

 Absorption of mineral salts, relation 



to transpiration, 166-167 

 Absorption of nitrogenous compounds, 



438-440 

 Absorption of solutes, effect of per- 

 meability on, 127 

 Absorption of water, 



by aerial organs, 283-284 

 daily periodicity of, 291-293 

 effect of concentration of soil solu- 

 tion on, 283 

 efifect of soil aeration on, 282-283 

 effect of soil temperature on, 



280-282 

 effect of soil water content on, 



280-281 

 mechanism of, 277-280 

 relation to absorption of mineral 



salts, 166, 492 

 relation of growth of roots to, 



276-277 

 relation to transpiration, 166, 277- 

 278, 291-292 

 Accelerators, enzymatic, 475-476 

 Accessory cells, 175 

 Accumulation of carbohydrates, effect 



on photosynthesis, 362 

 Accumulation of dyes, 411 

 Accumulation of electrolytes, 407-411 

 Accumulation of foods, 569-570 

 Acetaldehyde, 394, 542, 544 

 Acetic acid, 18 

 Acidity, total, 14 

 Acids, 13 



Activators, enzymatic, 475-476 

 Active absorption, 2 78-280 

 Adsorbate, 28 

 Adsorbent, 29 



Adsorption, 27-30 



biological significance, 30-31 



of water, 30, 108, 109 



role in catalysis, 462, 465 

 Adsorption theory of permeability, 



130-131 

 Aeration of soil, 250 

 Aeration of soil, effect of, 



on absorption of water, 282-283 



on growth, 609 

 After-ripening, 633-634 

 Alanine, 444 

 Albuminoids, 446 

 Albumins, 446 

 Alkaloids, 449-450 

 Alpha-naphthalene acetic acid, 582 

 Aluminum, role of, 426-427 

 Amino acids, 72, 438, 439 



oxidation of, 448-449, 510, 519 



permeability of cytoplasmic mem- 

 branes to, 122 



role in growth, 450-453, 554, 556, 

 558 _ 



synthesis of, 442 

 Ammonia, 447, 449 

 Ammonification, 455-456 

 Ammonium compounds, 



absorption of, 440 



in plants, 447-448 

 Amphoteric properties of protein sols, 



53, 465 

 Amygdalase, 470 

 Amygdalin, 381 

 Amylase, 377, 468-469, 477 

 Anaesthetics, effect of, 



in breaking dormancy of buds, 



638-639 

 on cytoplasmic streaming, 75 

 on permeability, 125 

 on photosynthesis, 360 

 on respiration, 527 



681 



