209 



B. The Leesburg Swamp.* 



By Will Scott. 



Xortlieni liifliana is dotted with lalves and swamps. Tliis land surface 

 is the result of the uneven deposits of the ice sheet and tlie nioditication 

 of these by the processes of erosion, sedimentation and plant deposition. 



Since the swamp illustrates so well the process throu,ij;h which present 

 conditions came to exist, it was thought worth while to select a typical 

 one, study its flora, physiography and plant depositions, and from these 



'•'Trees of northern United States, by Apgar, was used for the identification of trees. 

 Gray's Manual of Botany (sixth editioo) was used for the identification of flowering plants 

 other than trees. 



U— A. or Science. 



