xiv CONTENTS 



PAGE 



Absorption of Water 467 



Properties of the Soil 468 



Movements of Water 469 



Transpiration 470 



Photosynthesis 472 



Products of Photosynthesis 473 



Chemosynthesis 475 



Assimilation of Organic Food . . . 475 



Assimilation of Nitrogen 477 



Construction of Organic Compounds 479 



Ferments or Enzymes 479 



Excretion 480 



Respiration . . 480 



Anaerobic Respiration . 481 



Growth . " . . . ! . . 481 



Irritability ... . 483 



Nature of Stimuli 484 



Movements of Growth . 484 



Movements of Variation 486 



Chemical Stimuli 487 



Mechanical Stimuli 487 



Water as a Stimulus 489 



Geotropism 491 



Light 491 



Sleep-movements 492 



Heliotropism 492 



Bibliography 493 



CHAPTER XIV 

 PHYSIOLOGY (CONTINUED); RELATION TO ENVIRONMENT 



Aquatic Plants 495 



Land Plants .- 498 



Mesophytes 500 



Xerophytes 501 



Epiphytes 503 



Climbing Plants 504 



Protection against Cold 505 



Parasites and Saprophytes 505 



Carnivorous Plants 507 



Symbiosis 609 



Reproduction 610 



Distribution of Seeds 51 1 



Pollination 514 



Hydrophilous Flowers 615 



