X CONTENTS 



CHAPTER PAGE 



(VI) Delayed germination 932 



External factors 933 



Seedlings 934 



Buds 936 



VII. Plant associations 939 



VIII. Adaptation 947 



Adaptive response . . . . ... 947 



Fortuitous variation . ....... 95° 



Congenital and reaction structures •95' 



Survival through natural selection 95^ 



