TABLE OF CONTENTS 



Officers and Committees for 1922-1923 6 



Past Officers of the Acade:my 7 



MixmES of Council Meetings 9 



Minutes of the Fifteenth Annual Meeting^|«ckford 13 



Treasurer's Report ^j^^^^ 13 



Pafers Presented at General SifssiONS^^^^^P 



Production of Sound by the Applic^^^Wr Heat: Professor 



Chas. T. Knipp, Universitj' of Illinois 21 



Research in ^plied Acoustics at the Wallace Clement Sabine 



Laboratory. Paul E. Sabine, Geneva 26 



The Atom of the Chemist: W. H. Rodebush, University of 



Illinois 43 



Stellar Evolution: W. D. MacMillan, University of Chicago... 55 



Selecting and Encouraging Students of Superior Ability: Wm. 



A. Maddox, Rockford College . .' 75 



Some Phenomena in a Dying Lake: Melvin A. Brannon, Beloit 

 College 84 



Science versus Empiricism in Public Health Work: Isaac D. 



Rawlings. M D., Springfield 95 



Stored Energy: Francis B. Daniels, Chicago 99 



The Museum, the Original Exponent of Visual Education: 



Frank C. Baker, University of Illinois 107 



Papers on Biology and Agriculture: 



Notes on Havv'aiian Botany with Special Reference to the 



Fungi: F. L. Stevens, University of Illinois 115 



The Present Status of Paleobotany in Illinois: A. C. Noe, 



University of Chicago 119 



Notes on Illinois Mushrooms: W. B. McDougall, University 



of Illinois 121 



New Species of Fungi from Illinois: H. W. Anderson, Uni- 

 versity of Illinois 126 



Notes on New Diseases of Economic Crops in Illinois, 1919- 



1921: H. W. Anderson, University of Illinois 130 



The Illinois Plant Disease Suiyey: Leo R. Tehon, University 



of Illinois \ 141 



The Habitat of Naturalized (mmmon Barberrj' in Illinois: 



Leo R. Tehon, University ol Illinois 151 



Contributions to the Flora of Cfes County, Illinois: Frank C. 



Gates, Kansas State Agriculttural College 165 



The Introduced Weed Flora of Illinois: Henry T. Darlington, 

 Michigan State Agricultural College, Lansing. Mich 171 



The European Starling in Illinois: Frank Smith, University 

 of Illinois 185 



Ecological Survey of the Fauna of Lake Knox: Florence 



Adcock, Knox College 186 



A Preliminary Report on the Vertical Distribution of Water 

 Mites in Green Lake, Wisconsin: Ruth Marshall, Rockford 

 College 200 



Advantages of River Canyons for Ecological Study: Frank 



Thone, University of Chicago 202 



The Ecology of Rhus Toxicodendron: Helen Turner, Univer- 

 sity of Chicago 208 



The Early Development of the Vertebral Column of the Alli- 

 gator: George M. Higgins, Knox College 212 



