xiv VEGETABLE PHYSIOLOGY 



f 



CHAPTEE XVIII 



METABOLISM 



PAGK 



Constructive and destructive processes ; anabolism and katabolism 

 Constructive processes depending on katabolism Secretion Bye- 

 products Secretion of enzymes Formation of cell-walls, of starch 

 grains, of aleurone grains, of fat, of chlorophyll, of anthocyan 

 Formation of resin, of alkaloids, of acids Decomposition-products 

 of cellulose ; colouring matters ; nectar ; etherial oils . . 272-287 



CHAPTER XIX 



.THE ENEEGY OF THE PLANT 



Preliminary considerations The expenditure of energy in evaporation, 

 in constructive processes, in movements, in radiation, in light 

 Source of the energy of plants the radiant energy of the sun ; its 

 absorption by chlorophyll ; absorption of heat rays Fixation of 

 energy Kinetic and potential energy Distribution and liberation 

 of energy Eelation of respiratory processes to local utilisation of 

 potential energy Oxidative actions other than respiration Intra- 

 molecular or anaerobic respiration Fermentation Anaerobic 

 plants ... . ' ... . . . ".-.. - - . . 288-304 



CHAPTER XX 



GROWTH 



Relation of growth to constructive metabolism Definition of growth 

 Distribution of growth Conditions necessary for growth ; plastic 

 materials, turgescence, temperature, oxygen The grand period of 

 growth Growth of a cell and of a multicellular organ The region 

 of growth in the latter -Daily period of growth in length The 

 Auxanometer Variations in growth ; hyponasty and epinasty ; 

 nutation and circumnutation Tensions accompanying growth 

 Eectipetality . . . . . ' 305-319 



CHAPTER XXI 



TEMPERATURE AND ITS CONDITIONS 



Range of temperature through which the vital processes proceed ; 

 photosynthesis, germination Causes and effects of fluctuations of 



