CONTENTS 



Page 

 List of Illustrations 5 



Officers and Committees 6 



Past Officers 7 



Secretary's Report 8 



Report of the Treasurer 10 



Report of Committee on Conservation 11 



Report of the Committee on Ecological Survey 12 



President's Address: Investigations of Mineral Resources and 



Industries of the United States, Frank DeWolf 17 



Rigidity and Viscosity of the Earth and Behavior of Substances 



under Stress, A. A. Michelson 28 



International Phytogeographical Excursion, H. C. Cowles 29 



Recent Theories of Fertilization and Parthenogenesis, Frank 



R. Lillie 30 



Movement Toward a Unified Science Course in Secondary 



Schools, H. B. Shinn 39 



An Analysis of Some Textbooks in Zoology, Elliott R. Downing.. 44 



Progress of Secondary School Agriculture in Illinois 46 



Resistance and Reaction of Fishes to Temperature, Morris 



M. Wells _ 48 



Evaporation and Soil Moisture in Forests and Cultivated Fields, 



J. F. Groves 59 



Soil Moisture and Plant Succession, George D. Fuller 68 



Further Notes on Post-glacial Biota of Glacial Lake Chicago, 



Frank C. Baker 74 



Physiological Agreement among the Animals of Animal Com- 

 munities, V. E. Shelford 79 



Recent Views Converning Electrical Conductance in Solutions, 



L. I. Shaw 81 



Cyclonic Distribution of Weather Elements for Davenport, Iowa, 



Anton D. Udden 85 



Water Supply of Evanston, W. Lee Lewis 9 6 



Conditions Under Which the Vegetable Matter of the Illinois 



Coal Beds Accumulated, T. E. Savage 100 



Constitution and By-Laws Ill 



List of Members 114 



Index 121 



