The Molecular Spectrum of Ammonia. Preliminary Report. 



B. J. Spence, Northwestern University 128 



A Study of the Effect of Metals in Contact with Solutions of 

 Silver Halides in Various Solvents. J. H. Ransom and 

 D. W. Hanson, James Millikin University 131 



Recent Developments in Photochemistry. W. Albert Noyes, Jr., 



University of Chicago 136 



A Laboratory Experiment for Testing the Efficiency of a Screw 



Jack. A. P. Carman and R. F. Paton, University of Illinois 141 



The Relation of Flue Gas Analysis to the Efficiency of the Oil 

 Burner. George T. Parker and H. A. Geauque, Lombard 

 College, Galesburg 143 



Chemistry of Sewage Treatment. A. M. Buswell, Chief, Illinois 

 State Water Survey and Professor of Sanitary Chemistry, 

 University of Illinois 147 



The Inter-Relation of the Sciences. Paul L. Salzberg, Knox 



College 157 



Papers ox Geography and Geology: 



The Aim in Teaching Foreign Geography. Herman T. Lukens, 



Francis W. Parker School, Chicago 165 



Stream Pollution, a Growing Menace to Water Supplies. Fred 

 R. Jelliff, President of Knox County Academy of Science. . . 168 



Coal Balls Here and Abroad. A. C. Noe, University of Chicago. 179 



Glacial Phenomena in the Vicinity of Carbondale. J. E. Lamar, 

 Illinois State Geological Survey, Urbana 181 



Outline of the Geology of the Oregon Quadrangle. Arthur 



Bevan, University of Illinois 187 



Pot-holes and Certain Features of Glacial Abrasion. Terence T. 



Quirke, University of Illinois 194 



Some Questions in General and Petroleum Geology Which are 

 Suggested by Oil Occurrences in Crawford County, Pennsyl- 

 vanian Beds. James H. Hance, State Geological Survey 

 Division, Urbana 199 



The South American Indian — as a Geographic Study. William 



H. Haas, Northwestern University 204 



Paleozoic Karst Topography. George E. Ekblaw, State Geolog- 

 ical Survey 208 



Agricultural Adjustments to the Natural Environment in 

 Southeastern Minnesota during the Period of Bonanza 

 Wheat Farming. Charles C. Colby, University of Chicago. . 213 



The Cotton Industry of Southern Illinois. Frank H. Colyer, 



State Normal University, Carbondale 226 



The Correlation of the Maquoketa and Richmond Rocks of Iowa 



and Illinois. T. E. Savage, University of Illinois 233 



Papers on Medicine and Public Health: 



Humanizing Medical Education. Frederick R. Green, Chief, 



Editorial Department of "Health", Chicago 251 



Remarks Upon the Treatment of Paresis. Charles F. Read, 



M. D., State Alienist, Chicago 268 



The Relation of Animal Diseases to Public Health. Thomas G. 

 Hull, Chief, Diagnostic Laboratories, Illinois Department 

 of Public Health, Springfield 274 



Mosquito and Malaria Control in Illinois. Harry F. Ferguson, 

 Chief Sanitary Engineer, Division of Sanitary Engineering, 



State Department of Public Health, Springfield 279 



Practical Value of Full Time Health Officers. E. W. Weis, 



M. D., Director, Hygienic Institute, LaSalle 294 



Some Comments on the Physical Findings in High School Grad- 

 uates. J. Howard Beard, M. D., University Health Officer, 

 Urbana 298 



Diseases and Fate of Twins. Dr. I. A. Abt, Chicago 311 



4 



