CONTENTS. XV 



Page 



Fertilization 635 



Hybridization 640 



Germination . . . 644 



CHAPTER VI. 



MISCELLANEOUS PHENOMENA 647 



Sect. 1. EVOLUTION OF HEAT BY PLANTS 647 



Sect. 2. LUMINOSITY 649 



Sect. 3. MOVEMENTS OF PLANTS . . . 650 



PART IV. 

 GEOGRAPHICAL AND GEOLOGICAL BOTANY. 



CHAPTER I. 



GENERAL CONSIDERATIONS 658 



Sect. 1. INFLUENCE OF EXTERNAL AGENTS 658 



Secondary Natural Influences 661 



Effects of Human Interference 662 



Sect. 2. INFLUENCE OF THE LAWS OF DEVELOPMENT OF 



PLANTS 663 



Sect. 3. GEOLOGICAL INFLUENCES 666 



CHAPTER II. 



BOTANICAL GEOGRAPHY 668 



Sect. 1. DISTRIBUTION OF PLANTS IN CLIMATAL ZONES .... 668 



Sect. 2. REGIONS OF ALTITUDE 672 



Sect. 3. REGIONS OF VEGETATION 675 



Insular Floras 693 



Sect. 4. STATISTICS OF VEGETATION 696 



CHAPTER HI. 



BOTANICAL GEOLOGY 698 



Sect. 1. NATURE AND IMPORTANCE OF FOSSIL PLANTS 698 



Sect. 2. FOSSIL PLANTS CHARACTERIZING PARTICULAR FOR- 

 MATIONS . . 700 



INDEX TO SYSTEMATIC BOTANY 707 



GENERAL AND GLOSSARIAL INDEX . , . 730 



