Distribution of Oaks on the Lake Chicago Bars in Evanston 

 and New Trier Townships, W. G. Watermann, North- 

 western University 239 



Topographic Relief as a Factor in Plant Succession, Geo. D. 



Fuller, University of Chicago 243 



Notes on the Distribution of the Oaks and the Buckeye in 

 LaSalle County, Illinois, Geo. D. Fuller, University of Chi- 

 cago 247 



A Comparison of Soil Temperatures in Upland and Bottomland 



Forests, W. B. McDougall, University of Illinois 249 



Papers ox Zoology: 



Physiological Life Histories of Terrestrial Animals and Mod- 

 ern Methods of Representing Climate, Victor E. Shelford, 

 University of Illinois 257 



The Effect of Sewage and Other Pollution on Animal Life of 

 Rivers and Streams, Frank C. Baker, Curator Museum 

 of Natural History, University of Illinois 271 



Sexual Dimorphism in the Acanthocephala, H. J. Van Cleave, 



University of Illinois 280 



The Morphology of the Antorbital Process in the Urodeles, 



Geo. M. Higgins, University of Illinois 292 



Cnidosporidia in the Vicinity of Urbana, R. Kudo, University 



of Illinois 298 



Some Limiting Factors in the Use of Fungus Diseases for 

 Combating Insect Pests, R. D. Glasgow and C. S. Spooner, 

 Entomological Laboratories, 111., State Natural History 

 Survey, Urbana 303 



Notes on the Life-History of a Crane Fly of the Genus 

 Geranomyia Haliday (Tipulidae, Diptera), C. P. Alexan- 

 der and J. R. Malloch, State Natural History Survey, Ur- 

 bana 310 



Papers ox Geology axd Chemistry: 



The Intercision of Pike River, Near Kenosha, Wisconsin, 



J. R. Ball, Northwestern University 323 



Note of a New Indicator in Water Analysis, R. E. Green- 

 field and Edward Bartow, State Water Survey, Urbana... 326 



The Absorption of the Oxides of Nitrogen Formed in the 

 Silent Discharge, F. O. Anderegg and K. B. McEachron, 

 Purdue University 329 



CONSTITUTIOX AND By-LaWS 335 



List of Members Elected at Daxville Meetixg 339 



List of Members 343 



