l6 CONTENTS 



\ 



CHAPTER PAGE 



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 



