LIST OF ILLUSTRATIONS 



A Tropical Forest Frontispiece 



FIG. PAGE 



1. Darlingtonia calif arnica ...... 3 



2. Leaves of Sarracenia purpurea ..... 9 



3. Pitcher of Nepenthes distillaloria . . . . . 16 



4. Pitcher of Nepenthes bicalcarata showing downward- 



directed prickles ....... 27 



5. Elk's-horn Fern {Platycerium grande) .... 99 



6. Patch of Lichen grown synthetically by Bonnier (from 



sowing of fungus spores on algae) under bacteriolog- 

 ical precautions against entrance of foreign spores . 117 



7. Assai Palm {Euterpe oleracia~) 156 



8. Apparatus of Bonnier and Mangin, for analysis of gases 



given off by plants 166 



