CONTENTS xill 
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 cornposition 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—Zymase and the production of aleohol—Oxidases—Fermenta- 
tive activity of protoplasm— Assimilation 7 é A . 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 
