xii VEGETABLE PHYSIOLOGY 



PAGKF. 



ash of plants Conditions of absorption of substances in the soil 

 Absorption of nitrogen by leguminous plants Insectivorous plants 

 and their behaviour Absorption of metallic compounds ; silicon . 

 Absorption of carbon dioxide from the air ; its mechanism . 140-154 



CHAPTER XI 



THE CHLOKOPHYLL APPARATUS 



Formation of organic substances from the inorganic materials 

 absorbed Chlorophyll Structure of a chloroplast Properties of 

 chlorophyll ; its absorption spectrum Xanthophyll Erythrophyll 

 Composition of chlorophyll Distribution of the chloroplasts Ke- 

 lationship between the plastid and the colouring matter Leucoplasts 

 Conditions of formation of chlorophyll ; light, temperature, iron 

 Formation of carbohydrates by chloroplasts ; conditions of their 

 activity Theories of photosynthesis Eelation of starch to the 

 process Bays of light made use of in photosynthesis ; researches 

 of Engelmann, of Tmiriazeff Inhibition of the chlorophyll appara- 

 tus Formation of organic substance in its absence . . 155-172 



CHAPTEE XII 



THE CONSTRUCTION OF PROTEIDS 



Complexity of the composition of proteid ; its percentage composition 

 Classification of proteids ; albumins, globulins, albuminates, pro- 

 teoses, peptones, coagulated proteids, proteids soluble in alcohol 

 Synthesis of proteids in plants ; various hypotheses Locality of 

 proteid construction in the plant 173-183 



CHAPTEE XIII 



THE CONSTITUENTS OF THE ASH OF PLANTS 



Nature and composition of the ash Water-culture and the limitations 

 of its usefulness in the study of the ash Classification of the 

 constituents of the ash The selective power of plants Sulphur 

 and phosphorus Potassium, magnesium, calcium, iron Sodium, 

 silicon, chlorine, bromine, iodine, manganese Accidental con- 

 stituents of the ash Eelation of nitrogen and potassium to herbage 

 plants ..; . . . . 184-195 



