INDEX 



Aamodt, 372 

 Abderhalden, 53 

 Abscission of fruit, 363 

 Absorber of Ordojan, 164 

 Absorption, of mineral salts by plant 

 roots, 253 



of mineral substances at different 

 periods of development, 259- 

 261 



of water by the plant, 21-25 

 Absorption spectrum of chlorophyll, 



176 

 Acceptors, of hydrogen, 102 



of oxygen, 104 

 Acetaldehyde, 98-99 

 Activators of enzymes, 67 

 Active acidity of the soil, 245-247 

 Activity of enzymes, 66 

 Adsorbing capacity of soil, 253-255 

 Adsorbing soil complex, 253 

 Adsorption, 4, 253-255 

 Aeration of the soil, 252 

 Aerotropism, 157 

 Afterripening of seeds, 460 

 Albinism, 175 

 Albumins, 54 



Alcoholic fermentation, 97-101 

 Aleurone grains, 50-51, 79 

 Alpine plants, 135 

 Alumuium, toxicity of, 272 

 Amino acids, 2, 29, 50-55, 73-78 

 Ammonium in plants, 73-74 

 Ammonium ion, toxicity of, 224 

 Ammonium nitrogen, 220 

 Ammonium oxidation in the soil, 181 

 Amylase, 56, 70 

 Amylophilous plants, 163 

 Anaerobic processes in bog soils, 

 376-377 



Anaerobic respiration, 96-97 

 Andre, 267 



Antagonism of ions, 7, 140-141 

 Antienzymes, 67 

 Apparatus, Pettenkoffer's, 86 

 Arrhenius, 270 

 Artificial fertilizers, 235, 263 

 Ascent of water in the tree trunk, 320 

 Ash in plants, 239-240 

 Ash elements indispensable for 

 plants, 240-245 



ASKENASY, 330 



Asparagine, 73-77, 226 



Assimilates, 162-164 



Assimilation, of carbon, 161-167,. 

 194 

 of free nitrogen, 228-231 



Assimilation number, 180 



Atmospheric factors influencing^ 

 transpiration, 301-302 



Autolysis, 65, 69-70 



Autotrophic plants, 223 



Autotropism, 158 



Auxin, 123-127 



Auxographs, 119 



Available and unavailable soil mois- 

 ture, 28^290 



Azzi, 373 



B 



Bach, 70, 72, 103-104 

 Bacteria, hydrogen, 181 



nitrification, 182 



nodule, 232-235 



sulphur, 183-184 

 Bacteria-fixing nitrogen, 229-231 

 Bacteria-oxidizing iron salts, 184 

 Baeyer, Von, 184 

 Balanced solutions, 139-142 

 Beijerinck, 230 



465 



