53 



49. Tar-Forming Temperatures of American Coals, charts, 20 minutes 



O. C. Berry. 



GEOGRAPHY. 



50. Shawnee Mound, Tippecanoe County, A Glacial Alluvial Cone, 



charts and photographs, 10 minutes William A. McBeth 



GEOLOGY. 



51. Stratigraphic Correlation of the Outcrop at Spades, Indiana, 



15 minutes H. N. Coryell 



52. Pennsylvania Fossil Plants of the Bloomington Quadrangle, 



5 minutes J. F. Jackson 



53. Preliminary Geological History of Dearborn County, 10 minutes 



A.J. Bigney 



54. Notes on the Cause of Asterism in "Starolite" (Asteriated Quartz), 



charts and specimens, 10 minutes Frank B. Wade 



55. The Mississippian Section of Monroe County, charts, 15 minutes 



J. W. Beede 



56. The Flatwoods Region of Owen and Monroe Counties, Indiana, 



25 minutes Clyde A. Malott 



MATHEMATICS. 



57. Mechanical Device for Testing Mersenne Numbers for Primes, 



5 minutes Thomas E. Mason 



58. Some Properties of Binominal Coefficients, 20 minutes A. M. Kenyon 



METEOROLOGY. 



59. The Watertown, S. D., Tornado of June 23, 1914, 10 minutes 



J. Gladden Hutton 



PHYSICS. 



60. A New Lantern and Projector, lantern, 10 ininut°s Arthur L. Foley 



61. Some Text Book Inconsistencies, 5 minutes Arthur L. Foley 



62. The Mechanism of Light and Heat Radiations, 10 minutes 



James E. Weyant 



63. A Simple Form for the Carey Foster Bridge, lantern, 5 minutes 



J. P. Naylor 



64. The Change of the Radio Activity of Certain Springs, lantern. 



10 minutes R. R. Ramsey 



65. Radio Activity of Spring Water, lantern, 10 minutes R. R. Ramsey 



66. A Radio-Active Electroscope, lantern. 5 minutes Edwin Morrison 



