CONTENTS 



CHAPTER I. THE SEED 



PAGE 



I. THE STORAGE OF FOOD IN SEEDS 1 



II. SOME PHYSIOLOGICAL PROPERTIES OF SEEDS .... 10 



III. TYPES OF SEEDS '. ... 12 



IV. SEED DISPERSAL .......... 21 



FIELD WORK 28 



CHAPTER II. GERMINATION AND GROWTH 



I. PROCESSES ACCOMPANYING GERMINATION 29 



II. CONDITIONS OF GERMINATION 33 



III. DEVELOPMENT OF THE SEEDLING 40 



IV. GROWTH 47 



FIELD WORK 52 



CHAPTER III. THE ROOT 



I. OSMOSIS AND THE ACTION OF THE CELL ..... 53 



II. MINERAL NUTRIMENTS ABSORBED BY PLANTS^ ... 58 



III. STRUCTURE OF THE ROOT 61 



IV. THE WORK OF ROOTS 65 



V. DIFFERENT FORMS OF ROOTS" 72 



FIELD WORK 80 



CHAPTER IV. THE STEM 



I. FORMS AND GROWTH OF STEMS 81 



II. MODIFICATIONS OF THE STEM 88 



III. STEM STRUCTURE 



A. MONOCOTYLS 96 



B. HERBACEOUS DICOTYLS 102 



C. WOODY STEMMED DICOTYLS ..,,.. J07 



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