CONTENTS— Continued. 



Page 



Session of Saturday, February 19, afternoon 105 



The Ecology of the Skokie Marsh Area with Special Reference 



to the Mollusca, by F. C. Baker (abstract) 106 



Ecological Succession of Fish and Its Bearing on Fish Culture, 



by V. E. Shelford (abstract) 108 



Relic Dunes, a Life History, by F. C. Gates 110 



The Grand Tower (Onondaga) Formation of Illinois and Its 



Relation to the Jeffersonville Beds of Indiana, by T. 



E. Savage 116 



Observations on the Earthquake in the Upper Mississippi 



Valley, May 26, 1909, by J. A. Udden 132 



The Forest Associations of Northwestern Illinois by H. S. 



Pepoon 143 



List of Members elected February 18 and 19, 1910 156 



Constitution 159 



By-Laws 161 



List of Members 162 



Index 171 



