CONTENTS 
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 . 213-226 
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 . 227-247 
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—Zymase and the production of aleohol—Oxidases—Fermenta- 
tive activity of protoplasm—aAssimilation . . ‘i . 248-263 
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 . . 264-280 
CHAPTER XVIII 
THE ENERGY OF THE PLANY 
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 
