Table of Contents 



PAGE 



OfFICEKS AXD COMIIITTEES FOR 1920-21 5 



Past Officebs of the Ac.vdemy 6 



mrsxtes of the thirteenth axxual meeting 9 



Report of the Secbf.tabt 15 



Treasurer's Report IS 



Report of Licrabian 19 



Papers of General Interest: 



The Development of Smokeless Fuel From Illinois Coal, S. 



W. Parr, University of Illinois 23 



The Irwin Expedition About Cerro De Pasco and Lake Titicaca, 



William Ray Allen, University of Illinois 28 



Preserves of Natural Conditions, Victor E. Shelf ord. University 



of Illinois 37 



Gaining and Losing Power, Casper L. Redfield, Chicago 59 



Report on the Progress and Condition of the Illinois State 



Museum, A. R. Crook, Springfield 69 



Papers on Medicine. PrBLic Health and Sanitation: 



Some Comments on the Present Status of Tuberculosus, 



Walter Gelvin Bain, St. John's Hospital, Springfield 75 



A Statistical Study of Influenza in Illinois, Fiscal Year, July 

 1, 1918-June 30, 1919, Henry B. Hemenway, Dist. Health 



Office. Div. of Vital Statistics, Springfield 85 



Sanitary Districts in Illinois, G. C. Habermeyer and Edward 



Bartow, Urbana 96 



Papers on Psychologt and Physiology: 



A Possible Interpretation of the Synchronous Flashing of 



Fireflies, Christian A. Ruckmick, University of Illinois.. 109 

 The Cumulative Effect of Rotational Increments, Coleman 



R. Griffith. University of Illinois 122 



Evidence that Catalase is the Enzyme in Animals and Plants 

 Principally Responsible for Oxidation, W. E. Burge, Uni- 

 versity of Illinois 135 



Cause of the Increase in the Respiratory Metabolism in the 

 Fertilized Ovum, W. E. Burge, University of Illinois.... 136 

 Papers on Botany: 



Sooty Blotch of Pomaceous Fruits. Arthur S. Colby, Uni- 

 versity of Illinois 139 



The Genus Septoria, Presented in Tabulation with Discussion, 



Philip Garman and F. L. Stevens, University of Illinois. . 176 

 Progress in Barberry Eradication in Illinois During 1919, L. 



R. Tehon. L'. S. Department of Agriculture, Urbana 219 



Forest Distribution at the Ends of the Lake Chicago Beaches, 

 Lillian Marguerite Simmons, Northwestern Universitv. . 226 



