

CONTENTS 



PAGE 



List of Illustrations 5 



Officers and Committees for 1911-12 7 



Constitution and By-Laws 8 



Session of Friday, February- 17 — Morning: 



Address of Welcome, by Dean R. D. Salisbury of the Universit>- 



of Chicago 11 



Secretary's Report 12 



Treasurer's Report .'^. l-l 



Report of Membership Committee 1-1 



Repon of Committee on Deep Drilling 15 



Report of Committee to Influence Legislation to Restrict Collec- 

 tion of Birds and Eggs 16 



Report of Committee on Co-operation with Existing Xature- 



Study Agencies 13 



Session of Friday, February- 17 — Afternoon : 



Demonstration of the Vse of Oxygen in Mine Rescue Work 20 



Address on the Metallic Colors of Insects, by Prof. A. A. Michelson 20 



Session of Friday, Februan.- 17 — Evening : 



Address by the President. Prof. John M. Couher 21 



Session of Saturday, February 18 — Morning: 



SjTnposium on Radioactivity 21 



Address on The Relation of the Soil to Plants 22 



Session of Saturday. Februar>- 18 — Afternoon : 



Report of the Committee on Assistance of the Academy to High 



Schools in Science Teaching 22 



Report of the Committee on Ecological Survey 24 



Report of the Committee to Influence Legislation in Favor of 



Increased Protection for Game Birds 26 



Publication of the Academy Transactions by the State 27 



Report of the Nomination Committee 27 



The President's Address 2S 



I. Symposium ox R.\dioactivity : 



I. Physical Properties of Radium, by Henr}- Crew 43 



II. Radium from the Astronomical Point of View, by Edwin B. 

 Frost 52 



III. Radiochemistr}-. by William A. Xoyes 55 



IV. Radioactivity and Geological Phenomena, by Thos. C. 

 Chamberlin 57 



V. The Biological Effect of Radium, by William A. Pusey 75 



II. Geological Papers: 



Oil Investigations in Illinois, by Raymond S. Blatchley 85 



The Channahon and Essex Limestones in Illinois, by T. E. Savage 97 

 The Eastward Extension of the Sweetland Creek Shale in Illinois, 



by J. A. Udden 103 



An American Lepidostrobus. by John M. Coulter and W. J. G. 



Land ; Abstract 107 



Post-glacial Life of Wilmette Bav, Glacial Lake Chicago, by 



Frank C. Baker 108 



