64 ECOLOGICAL RELATIONS OF THE FLORA. 



Warming, E. 



1909. Oecology of Plants. Oxford. 

 Weber, C. A. 



1902. Uber die Vegetation und Entstehung des Hochmoors von 

 Augstumal. Berlin. 

 Whitford,, H. N. 



1901. Genetic Development of Forests of Northern Michigan. Bot. 

 Gaz., 31:289-325, figs. 1-18. 



University of Nebraska, December, 1909. 



