x CONTENTS 



CHAPTER f PAGE 



(VI) Delayed germination 932 



External factors . . . . . . . . . 933 



Seedlings . 934 



Buds . .... . . . . . . 936 



VII. Plant associations . . . . 939 



VIII. Adaptation . . . .; 947 



Adaptive response , 947 



Fortuitous variation 950 



Congenital and reaction structures 951 



Survival through natural selection 952 



