PLATI5 XLVIII. 



Fig-. 1. Blufif at Camp Logan. Illinois, being- cut by Lake Michigan, showing exposed 

 roots of Calamovilfa longifolia on the left, and of red-osier dogwood [Cornm, stolonifera) on the 

 right. September 4, 1909. 



Fig. 2. Part of the beach near Beach, Illinois, showing an Ammopliihi dune in the 

 foreground, a Salix glajicophylla dune on the right, and, in the center of the background, 

 a Popnlns caiidicatis dune. September 11, 1909. 



