PAGE 



Some of the Factors Influencing the Distribution of Animal 



Parasites. H. J. Van Cleave, University of Illinois 136 



The Shifting of the Mammalian Faunas, as shown by the 

 Pleistocene Remains of Illinois. L. A. Adams, University 

 of Illinois 140 



Testing Lamarck's Theory. Casper L. Redfield, Chicago 145 



Blooming Records of the Apple. C. S. Crandall, University of 



Illinois 155 



An Ecological Survey and Flora of Lake Knox. Paul K. 



Houdek, Knox College 163 



Seasonal Changes in the Insect Population of an Illinois For- 

 est. A. O. Weese, James Millikin University 171 



The Effect of Selection on the Length of Spine in Daphnia 



Longispina. Mrs. Margaret Smith Young, Chicago 176 



Regeneration in Bryophyllum Crenatum. Mary E. Renich, 



State Normal University, Normal 183 



Barberry Eradication in Illinois. F. E. Kempton, G. C. Curran, 



E. D. Griffin 198 



Growth Studies of Certain Bottomland Species in Southern 



Illinois. C. J. Telford, University of Illinois 210 



Bogs of Northern Illinois, II. W. G. Waterman, Northwestern 



University 214 



Farm Woodlots in Illinois. W. F. Schreeder, University of 



Illinois 226 



Wood Consumption and Wood Production in Illinois and their 

 Relation to the Future Prosperity of the State. R. B. 

 Miller, State Forester, Urbana 233 



Legumes as a Source of Nitrate for Farm Crops. H. J. Snider, 



University of Illinois 239 



A Summary of the Plant Disease Situation in 1922 with re- 

 spect to the Crops of Illinois. Leo R. Tehon, State 

 Natural History Survey, Urbana 246 



Origin of Prairies in Illinois. John Woodard, University of 



Illinois ! 259 



Papers on Chemistry ami Physics: 



The Problem of Cold Light. Harvey A. Neville, University of 



Illinois 267 



Standardized Tests. W. C. Hawthorne, Crane Junior College, 



Chicago 274 



Photoelectric Effect of Caesium Vapor and a New Determina- 

 tion of h, The Universal Constant of Planck. Jakob Kunz 

 and E. H. Williams, University of Illinois 27!' 



A Comparative Study of Soil Acidity Methods on Illinois Soils. 



E. E. DeTurk and J. W. Coale, University of Illinois 280 



Penetration Tests in Wood-Preservation. George T. Parker 



and H. A. Geauque, Lombard College 295 



A Carbon Film High Resistance; its Construction and Charac- 

 teristics. A. J. McMaster, University of Illinois 299 



Some Aspects of Phosphorus Behavior in Soils. M. I. Wolkoff, 



University of Illinois 308 



Notes on the Quantum Theory and Relativity. Jacob Kunz, 



University of Illinois 323 



Papers on Geography and Geology: 



The Origin of the Cahokia Mounds. Morris M. Leighton, Illi- 

 nois Geological Survey, Urbana 327 



The Use of Molluscan Shells by the Cahokia Mound Builders. 



Frank C. Baker, University of Illinois 328 



