Section Xv. the Seed 125

Seed-coats and their appendages 125 The Kernel or Nucleus, Embryo and its parts, Albumen 127

SECTION XVI. VEGETABLE LIFE AND WORK 128

Sec. 1. ANATOMICAL STRUCTURE AND GROWTH 129

Nature of Growth, Protoplasm 129 Cells and Cell-walls. Cellular Structure or Tissue 130 Strengthening Cells. Wood, Wood-cells, Vessels or Ducts 132

Sec. 2. CELL-CONTENTS 136

Sap, Chlorophyll, Starch 136 Crystals, Rhaphides 137

Sec. 3. ANATOMY OF ROOTS AND STEMS 138

Endogenous and Exogenous Stems 139 Particular structure of the latter 140 Wood, Sapwood and Heart-wood. The living parts of a Tree 141

Sec. 4. ANATOMY OF LEAVES 142

Epidermis, Stomata or Breathing pores 143

Sec. 5. PLANT FOOD AND ASSIMILATION 144

Sec. 6. PLANT WORK AND MOVEMENT 149

Movements in Cells or Cyclosis 149 Transference from Cell to Cell 150 Movements of Organs, Twining Stems, Leaf-movements 150 Movements of Tendrils, Sensitiveness 152 Movements in Flowers 153 Movements for capture of Insects 154 Work costs, using up Material and Energy 155