50 PROCEEDINGS OF THE INDIANA ACADEMY OF SCIENCE. 



31. The Tornado of Northern Washington Co., Ind.. Jan. 19, 191G 



(Illustr.), 10 min Clyde A. Malott 



32. Some Peculiarities of Blue River, Indiana Clyde A. Malott 



33. The Wabash Valley and the Maumee Outlet, 15 niin. 



C. H. Dryer and B. K. Shoekel 



33A. The Fossil Plants of the Lower Coal Measures of Indiana 



Thomas F. Jaekson 



M.\THEMATICS. 



34. A Direet Proof of Poincare's Last Theorem, 20 min 



Tobias Dautzig 



34. A. The Use of Mathematies in the Seiences, 10 min Geo. Spitzer 



34B. What Might Have Been C. A. Waldo 



Physics. 



35. An Investigation of the Nature of the Kleetrie Spark in Air, 



10 min. (Lantern) .Vrtliur L. Foley 



3(). A Photographic St udy of t he Velocity of Souiul Waves in Tubi's 



and between Walls, 10 min. (Lantern) Arthur L. Foley 



37. New Methods of Consli-iicting ( 'ondmscrs. ."> iiiiii \rthur L. Foley 



3S. A Kinetic Model of an FIcclroii .\toMi. 10 min Holla R. liamey 



30. A Preliminary Account of an Fxpcriincnt on X-Ray Diffraction 



Fringes, 10 min Mason K. liufford 



40. .\ Pliotograi)hic investigation of the Vibratory Charactei' of 



Kxplosion Wanes, 10 min John B. Dutcher 



4L .\n Investigation to Deterim'ne the Best Conditions for the Pro- 

 jection of the Brownian M(»nument, 10 min Charles Hire 



42. .Some Peculiar Effect Produced on Photograjjliic Plates When 



Placed in the Neighborhood of High i'olentia! Discharges 



5 min .Xrthur !.,. Foley 



43. A Photf)g7-ai)hic Investigation of the Kffect of Inductance and 



Capacity on the Electric Spark Arthur L. Foley 



43a. .\ New Form of Telescope Mounting W. A. Cogshall 



Zo<)i,o(;v. 



44. .\ List of Indiana Dragonflies, 5 min F. B. Williamson 



45. Field Notes on Distribution and Life Habits of the Tiger 



Beetles of Indiana, 10 min Wm. M. (loldsinitii 



40. The Resi)ira1orv Mechanism of Two Rare Amphibians (Tyi)h- 



loinolge and Ichthyoj)liis), 10 min H. L. Bruner. 



47. The Smooth Nasal Muscles of Reptiles, 10 min H. L. Bruner 



4N. Further Notes on Indiana Birds, 10 min .\inos W. Butler 



40. .Vnother South .\merican Kxpeditiou, 10 min C. II. Kigenmann 



