CONTENTS ix 



CHAPTER VI. 



PAGE 



The Absorption of Food-materials by a Green Plant 435 



Substances absorbed 435 



Absorption from the soil 436 



„ ,, air 438 



CHAPTER VII. 



The Chloroplastids and their Function . . 440 



Properties of chlorophyll 441 



Formation of carbohydrates 442 



„ proteids 444 



CHAPTER Vin. 



Reserve Materials and their Deposition . . 447 



Removal of the surplus material constructed .... 447 



Path of the stream of elaborated products 448 



Formation of starch grains ....... 449 



Other carbohydrate stores . . 450 



Aleurone grains 451 



Fats, oils, glucosides, &c 452 



CHAPTER IX. 



Digestion of Reserve Materials . . . 453 



Nature of digestion . 453 



Enzymes or unorganised ferments 454 



Digestive power of the protoplasm 459 



CHAPTER X. 



The Catabolic Processes . . . 460 



Nature of catabolism 460 



Secretion 461 



