CONTENTS xi 



PART III. 

 CONCLUSION 



CHAPTER PAGE 



XLI. ALGAE AND BRVOPHYTA, 658 



XLII. EMBRYOGENY OF THE PTERIDOPHYTES, 663 



XLI 1 1. THE VEGETATIVE SYSTEM OF VASCULAR PLANTS ANALYSED, 678 



XLIV. THE VASCULAR SKELETON,- 685 



XLV. THE SPORE-PRODUCING MEMBERS, 692 



XLVI. HETEROSPORY AND THE SEED-HABIT, 703 



XLV 1 1. RESULTS, PHYLETIC AND MORPHOLOGICAL, 709 



INDEX, - 718 



