l6 CONTENTS 



CHAPTER FACE 



XIV. THE SIMPLEST LAND PLANTS LIVERWORTS 



AND MOSSES. THE PTERIDOPHYTA . .231 



XV. THE SEED PLANTS : FORMS AND LIFE HISTORIES 254 



XVI. THE TISSUE ELEMENTS OF SEED PLANTS . . 270 



XVII. THE ROOT . . . . . . . . .288 



XVIII. THE FOLIAGE LEAF 302 



XIX. THE PRIMARY STEM 315 



XX. THE WOODY STEM 328 



XXI. THE FLOWER 344 



XXII. THE FRUIT 361 



XXIII. THE SEED AND ITS GERMINATION . . . . 375 



XXIV. CONCLUSION 389 



INDEX 405 



