53 



Physics. 



36. Energy Loss in Commercial Hammers, 15 min 



Edwin Morrison and Robert L. Pelry, Eai-lham College 



37. Some Experiments on Resonance of Tubes and Horns, 5 min. . . 



Arthur L. Foley, Indiana Univei'sity 



38. Two New Photographic Methods of Measuring the Speed of 



Sound Waves, 10 min Arthur L. Foley, Indiana University 



39. Conditions Affecting the Speed of Sound Waves, 10 min 



Arthur L. Foley, Indiana University 



40. The Conduction of Heat and Electi-icity Thru Selenium, 10 min. 



Arthur L. Foley, Indiana University 



41. Some Observations on Fluorescence, 5 min 



Arthur L. Foley, Indiana University 



42. Further Notes on the Identity of X-Rays and Light, 10 min.. . . 



Mason E. Hufford, Indiana University 



43. An improved Form of High Vacuum High Speed Mercury Vapor 



Air Pump, 10 min Charles T. Knipp, University of Illinois 



43a. A Possible Standard of Sound. Chas. T. Knipp, University of Illinois 



44. Visible Color Effects in a Positive Ray Tube Containing Helium, 



10 min Chas. T. Knipp, University of Illinois 



Zoology. 



45. The Effect of Artificial Selection upon Bristle Number in the 



Fruit Fly and the Interpretation of the Results, 15 min. . . 

 F. Payne, Indiana University 



46. The Unionidse of Lake Maxinkuckee, 20 min. (by title) 



. . . .Barton Warren Evermann, California Academy of Science; 

 Howard Walton Clark, U. S. Biological Station, Fairport, Iowa 



47. A Day with the Birds of a Hoosier Swamp, 10 min. (by title) . . . 



Barton Warren Evermann, California Academy of Science 



48. Further Experiments with the New Mutant, Scarlet in the Dro- 



sophila Repleta, 10 min H. W. Cromwell 



49. A Seasonal Study of the Stickleback Kidney, Cayuga Jordan, 15 



min Walter N. Hess, DePauw Univei-sity 



50. On the Locus of the Gene for the Mutant, Curved (by title) . . 



Roscoe R. Hyde, Indiana State Normal 



