CONTENTS 



CHAPTEE VI. 



PAGE 



The Absorption of Pood-mateeials by a Gkeen Plant 435 



Substances absorbed 435 



Absorption from the soil . . . ... 436 



„ „ air 438 



CHAPTEE VII. 



The Chloroplastids and their Function . . 440 



Properties of chlorophyll . . 441 



Formation of carbohydrates . . . ... 442 



„ proteids . . 444 



CHAPTEE Vin. 



Eeserve Materials and their Deposition . . 447 



Eemoval 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, glueosides, &c. ... .... 452 



CHAPTEE IX. 



Digestion of Eeserve Materials . . . 453 



Nature of digestion . 453 



Enzymes or unorganised ferments ... . 454 



Digestive power of the protoplasm . . ... 459 



CHAPTEE X. 



The Catabolic Processes . . . 460 



Nature of oatabolism 460 



Secretion 461 



