PI.ATI5 XLIX. 



Pig. 1. Section of a 'yuuiperiis lion'zoiitulh dune, Beach, Illinois. 

 July 19, 1909. 



Fig-. 2. A willow (Sahx olaticophvUa') dune, 0.7 meter high, near Kenosha, Wisconsin. 

 November 23, 1909. 



