VI] FIXITY OF POSITION IN PLANTS 101 



The difficulties which beset polHiiation and dissemina- 

 tion have followed as secondary consequences. They 

 have been overcome by those adaptations which 

 command our interest and admiration. But too 

 often the interest in the adaptations themselves has 

 tended to obscure the prime cause which brought 

 them into existence. It has been the object of this 

 essay to place the cause and its consequences in their 

 proper relation one to another. 



