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TABLE OF CONTENTS. 



PAGE 



Officers and Committees for 1924-1925 6 



Past Officers of the Illinois State Academy of Science 7 



mlnutes of council meetings 11 



Minutes of the Seventeenth Annual Meeting. Elgin 14 



Treasurer's Report 15 



Resolutions Presented at the Elgin Meeting 21 



Papers Presented at General Sessions: 



Plant Communities of Glacier National Park. Montana. W, G. 



Waterman, Northwestern University 29 



Mental Hygiene as a Problem of Public Health. Herman M. 



Adler. M. D.. Criminologist, Department of Public Welfare. 



Chicago : 35 



The Year's Progress in Public Health and Medicine. W. A. 



Evans. M. D., Health Editor. Chicago Tribune. „ 44 



The American High School Versus the English Public School. 



F. H. Crawford. Northwestern University 53 



The Glacial History of the Elgin Region. M. M. Leighton, 



Chief. Illinois Geological Survey 65 



Plant Life in the Elgin Region. H. C. Cowles. University of 



Chicago. (Paper not handed in for publication) 72 



Papers on Biology and Agriculture: 



Some Radical Departures on the Teaching of Biology. Elliot 



R. Downing, University of Chicago 75 



Certain Differences between Text-book Earthworms and Real 



Earthworms. Frank Smith, University of Illinois 7^ 



A New Mushroom. W. B. McDougall. University of Illinois. ... S4 

 Presence of Living Organisms in Lake Ice. Samuel Eddy, 



James Millikin University So 



Some Southwestern Limits of Plants in Indiana, Illinois and 



Iowa, with Suggestions on the Significance of the Phe- 

 nomena Observed. H. C. Cowles. University of Chicago. 



(Paper not submitted for publication) 87 



Some Outstanding Features of the Plant Disease Situation in 



Illinois During 1923. L. R. Tehon. State Natural History 



Survey. Urbana 88 



Some North and South Stream Valleys in Illinois and their 



Vegetation. George D. Fuller, The University of Chicago. 



and C. J. Telford. Assistant Illinois State Forester 94 



Preliminary Check List of the Vascular Plants of the Illinois 



State Park at Starved Rock, LaSalle County. Frank Thone, 



University of Arkansas, Fayettville. Arkansas 100 



Forest Preservation — The Patriot's Duty. E. M. North. Des- 



Plaines, Illinois 107 



Papers on Chemistry and Physics: 



The Variation of Pitch of the New Singing Tube with Length. 



Chas. T. Knipp and A. J. McMaster, University of Illinois. . 115 

 Positive Reactions of Halogens Attached to Carbons. Ben H. 



Nicolet. University of Chicago 118 



A Simple Form of C. T. R. Wilson's Alpha-Ray Apparatus. 



Charles T. Knipp and N. E. Sowers. University of Illinois. . 121 

 A Note on the Effect of Temperature on the Transition of Calcite 



to Aragonite. R. Edman Greenfield, Chemist, State Water 



Survey, Urbana, Illinois 125 



