51 



20. Detection of Nickel in Cobalt Salts, 8 min., 



A. It. Middleton and H. L. Miller 



21. The Use of the Spectrophotometer in Chemical Analysis, 



10 min George Spitzer and D. C. Duncan 



22. The Different Methods of Estimating Protein in Milk. .George Spitzer 



Geology 



23. A New Cave Near Versailles, 5 min A. J. Bigney 



24. Loess Deposits in Vigo County, Indiana, 10 min. . . ,Wm. A. McBeth 



25. Volume of the Glacial Wabash River, 10 min Wm. A. McBeth 



26. A Geologic Map of the Terre Haute Region, 5 min. . . . B. H. Schockel 



27. A Bibliography of Geographical Material, 10 min B. H. Schockel 



28. Settlement and Development of the Lead and Zinc Mining Region 



of the Upper Mississippi, 20 min B. H. Shockel 



29. A Few Science Wonders of the Cement Age, 15 min., 



lantern F. W. Gottlieb 



30. The Fauna of the Trenton and Black River Series of New 



York H. N. Coryell 



Mathematics 



31. Gamma Coefficients with Applications to the Solution of Dif- 



ference Equations and Determination of Symmetric Func- 

 tions of the Roots of an Equation in the Terms of the 

 Coefficients, 25 min Arthur S. Hathaway 



32. Some Determinants Connected with the Bernoulli Numbers, 



K. P. Williams 



33. Some Relations of Plane to Spheric Geometry, 



10 min David A. Rothrock 



Physics 



34. Some Notes on the Mechanism of Light and Heat Radiations, 



15 min James E. Wyant 



35. A Standard for the Measurement of High Voltages, 



10 min C. Francis Harding 



36. Ionization Produced by Different Thicknesses of Uranium 



Oxide, 5 min Edwin Morrison 



37. Radioactivity of Richmond Water, 5 min Edwin Morrison 



