xxvi CONTENTS 



CHAPTER XXXIII 

 SEED-DISPERSAL AND GEOLOGICAL TIME 



The shifting of the source of Polynesian plants from the New to the Old 

 World. The floral history of Polynesia stated in terms of geological time. 

 The suspension of the agencies of dispersal in later periods. Parallel 

 differentiation in the course of ages of climate, bird, and plant. New 

 Zealand. Insects and bats as agents in plant-dispersal. The effective 

 agency of sea-birds in other regions. The observations of Ekstam. The 

 Spitzbergen controversy. The efficacy of ducks as distributors of aquatic 

 plants. Summary Pages 502 514 



CHAPTER XXXIV 

 r GENERAL ARGUMENT AND CONCLUSION Pages 515523 



APPENDIX Pages 525605 



