258 



SCIENCE 



[N. S. Vol. XXXIII. No. 842 



Ait the joint sessions for the reading of research 

 papers the following list was presented: 



" The Ratio of the Two Heat Capacities of 

 Carbon Dioxide as a Function of the Pressure 

 and the Temperature," A. G. Worthing, Univer- 

 sity of Michigan. 



" On the Adiabatic Expansion and Porous Plug 

 Effect in Water between 0° and 40°," John R. 

 Roebuck, University of Wisconsin. 



" The Acoustic Shadow of a Sphere; the Theory 

 and Certain Practical Applications," G. W. Stew- 

 art, State University of Iowa. 



" On the Function of Rest in Restoring a 

 Platinum-iridium Wire to its Annealed Condi- 

 tion," L. P. Sieg, State University of Iowa. 



" The Nature of the Recovery of Light-positive 

 and Light-negative Selenium," F. C. Brown, State 

 University of Iowa. 



" On the Fluorescence Spectra of the Uranyl 

 Salts and the Structure of Luminescence Spectra 

 in General," Edward L. Nichols and Ernest Mer- 

 ritt, Cornell University. 



" The Effect of Red and Infra-red on the Decay 

 of Phosphorescence in Zinc Sulphide," Herbert E. 

 Ives and M. Luckiesh, National Electric. Light 

 Association, Cleveland, O. 



" Ocean Currents and Barometric Highs," W. J. 

 Humphreys, Mount Weather Observatory, Blue- 

 mont, Va. 



" Ocean Currents and Barometric Lows," W. J. 

 Humphreys, Mount Weather Observatory, Blue- 

 mont, Va. 



" The Light-emission of Tungsten, Tantalum 

 and Carbon as a Function of their True Tempera- 

 ture," C. E. Mendenhall and W. E. Forsythe, Uni- 

 versity of Wisconsin. 



" The Pentane Lamp as a Primary Light Stand- 

 ard," E. B. Rosa and E. C. Crittenden, Bureau 

 of Standards. 



" Experimental Indications of the Nature of 

 Magnetism," S. R. Williams, Oberlin College. 



" The Effect of Magnetization on the Optical 

 Constants of the Magnetic Metals," L. R. Inger- 

 soll. University of Wisconsin. 



"The Second Postulate of Relativity," O. M. 

 Stewart, University of Missouri. 



" A Preliminary Report of Experiments on the 

 Effect of Changes in the Pressu.re of Gases upon 

 the Mobility of Positive and Negative Ions Pro- 

 duced by the Discharge of Electricity from a 

 Fine Point," E. J. Moore, Oberlin College. 



" The Transmission of Excited Radioactivity," 

 Wellish, Yale University. 



" The Coefficient of Recombination of Ions in 

 Carbon-dioxid and Hydrogen," Harry A. Erikson, 

 University of Minnesota. 



" A Method of Measuring the Fluctuations in a 

 Rapidly Varying Resistance," F. C. Brown and 

 W. H. Clark, State University of Iowa. 



" The Causes of Zero Displacement and Deflec- 

 tion Hysteresis in Moving-coil Galvanometers," 

 Anthony Zeleny, University of Minnesota. 



" The Effect of Wave Form upon Incandescent 

 Lamps," M. G. Lloyd, Chicago, 111. 



" Diffraction and Secondary Radiation with 

 Short Electric Waves," A. D. Cole, Ohio State 

 University. 



" Notes on the Discharge of Electricity through 

 Gases," G. S. Fulcher, University of Wisconsin. 



" The Free-expansion and Joule-Kelvin Effects 

 in Air and in Carbon Dioxide," A. G. Worthing, 

 University of Michigan. 



" On the Temperature Coeffiicients of the Free 

 and the Absorbed .Charges in Electric Condensers," 

 Anthony Zeleny, University of Minnesota. 



" Terminal Velocity of Fall of Small Spheres 

 in Air at Reduced Pressures," L. W. McKeehan, 

 University of Minnesota. 



" The Electrical Discharge between a Pointed 

 Conductor and a Hemispherical Surface in Gases 

 at Different Pressures," Franz A. Aust, Univer- 

 sity of Minnesota. 



"The Effect of Distance upon the Electrical 

 Discharge between a Point and a Plane," O. 

 Hovda, University of Minnesota. 



" A Lecture Electroscope for Radioactivity." 



" A Variable High Resistance of India Ink on 

 Paper," Franz A. Aust, University of Minnesota. 



" The Electrical Discharge from Liquid Points," 

 John Zeleny, University of Minnesota. 



" A Microscope Plate Micrometer," John Z.eleny 

 and L. W. McKeehan, University of Minnesota. 



"A Kinetic Theory of Gravitation," Chas. F. 

 Brush, Cleveland. 



" On a Variation in the Intensity of the Pene- 

 trating Radiation at the Earth's Surface observed 

 during the Passage of Halley's Comet," Arthur 

 Thomson, University of Toronto. 



" On the Resolution of the Spectral Lines of 

 Mercury," J. C. McLennan, University of Toronto. 



" Infra-red Gratings," C. F. Brackett and A. 

 Trowbridge. 



" The Question of Valency in Gaseous Ioniza- 

 tion," R. A. Millikan and Harvey Fletcher. 



" A Probable Explanation of the Irregularities 

 obtained by Ehrenhaft and Przibram in their 

 Work on the Value of the Elementary Electrical 



