CONTENTS xiii 



PAGE 



Mode of transport of substances in the plant ; osmosis and diffusion ; 

 temporary storage Translocatory and storage forms of food The 

 so-called descending sap The pathway of translocation . 207-220 



CHAPTER XV 



THE STORAGE OF RESERVE MATERIALS 



Connection between transport and storage ; forms in which food is 

 stored Reservoirs of storage ; stems, roots, floral organs Storage 

 of carbohydrates ; starch grains and their formation by chloro- 

 plasts and leucoplasts, by the cytoplasm ; glycogen ; inulin ; 

 sugars ; cellulose and similar compounds Storage of proteins ; 

 aleurone grains, their composition and mode of formation ; protein 

 crystals ; antecedents of gluten Storage of asparagin ; glucosides ; 

 fats and oils Mode of formation of the last-named group . 221 241 



CHAPTER XVI 



DIGESTION OF RESERVE MATERIALS 



Nature of digestion Its localisation in plants Agents of digestion 

 Secretion of enzymes Conditions of their action Zymogens 

 Differentiation of glandular structures Classification of enzymes 

 Diastase and its action on starch Inulase Invertase Glucase 

 Cytase and cell-walls Pectase Proteoclastic enzymes Rennet 

 Enzymes which decompose glucosides Lipase and its action on 

 fats Zymaseand the production of alcohol Oxidases Fermenta- 

 tive activity of protoplasm Assimilation .... 242-257 



CHAPTER XVII 



METABOLISM 



Constructive and destructive processes ; anabolism and katabolism - 

 Constructive processes depending on katabolism Secretion Bye- 

 products Secretion of enzymes Formation of cell-wells, 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 . . 258-274 



CHAPTER XVIII 



THE ENERGY 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 



