IOWA ACADEMY OF SCIENCE 



Titles of Papers Received 



The number following a title indicates the page of the Proceedings 

 on which it may be found. 



PAGE 



Pure Sodium Chloride Nicholas Knight 25 



Barium in Tobacco Nicholas Knight 26 



Some Rock Analyses Nicholas Knight 29 



An Improved Method of Determining Solubility 



W. S. Hendrixson 31 



Acid Potassium and Sodium Fhthalates as Standards in Acidi- 



metry and Alkalimetry, II W. S. Hendrixson 



The Behavior of Solutions at the Critical Temperature, a Pre- 

 liminary Report Perry A. Bond 35 



Some Auxoamylases E. W. Rockwood 37 



A Comparison of Barbituric Acid, Thiobarbituric Acid and 

 Malonylguanidine as Quantitative Precipitants for Fur- 

 fural A. W. Dox and G. P. Plaisance 41 



An Accurate Aeration Method for Determining Alcohol in 



Fermentation Mixtures A. W. Dox and A. R. Lame 



Relative Influence of Bacteria and Enzymes on Silage Fer- 

 mentation, Preliminary Report A. R. Lamb 



Estimation of Calcium in Ash of Forage Plants and Animal 



Carcasses S. B. Kuzirian 



Electromotive Forces and Electrode Potentials in Pure and 



Mixed Solvents, II F. S. Mortimore and J. N. Pearce. 51 



The Pleasant Ridge Group of Effigy Mounds Ellison Orr 



An Old Roman Coin in South Dakota David H. Boot 73 



Geological Conditions Regarding Oil and Gas in Southeastern 



Iowa George F. Kay 



The SuperKansan Gumbo of Southern Iowa George F. Kay 



Progress Report on Studies of the Iowan Drift by the Iowa 

 Geological Survey and the United States Geological Survey 



George F. Kay 75 



Contributions to the Geology of Southwestern Iowa 



George L. Smith 77 



Records of Oscillations in Lake Level, and Records of Lake 

 Temperature and Meteorology Secured at the Macbride 



Lakeside Laboratory, Lake Okoboji, Iowa, July, 1915 



John L. Tilton 91 



Controlling Fault Systems in Iowa Charles Keyes 103 



Terranal Affinities of Original Chouteau Limestone 



Charles Keyes 113 



Coast Range Cirques of the Skeena Basin Charles Keyes 119 



Progress Report ©f Geological Work in the Driftless Area 



A. C. Trowbridge 



The History of Devil's Lake, Wisconsin A. C. Trowbridge 



