PrAgE oo LT: 
Fig. 1. East Branch of the Chicago River, looking north from flood-plain. Photograph taken Sep- 
tember 5, 1908. Compare the river bed with Plate XVII, 2. These two plates well illustrate spring and 
fall conditions in this area. (Woodruff.) 
‘ig. 2. North Branch of the Chicago River, looking north from Shermerville. Photograph taken 
at high-water stage. May 18.1908. (Woodruff.) 
