March 3, 1916] 



SCIENCE 



321 



"The Coefficient of Total Eadiation of a Uni- 

 formly Heated Enclosure," by W. W. Coblentz 

 and W. B. Etnerson. 



"A Luminosity Curve Equation and its Appli- 

 cation to the Black Body," by E. P. Kingsbury. 



"Black Body Brightness and the Mechanical 

 Equivalent of Light," by Herbert E. Ives and E. 

 E. Kingsbury. 



' ' The True Temperature Scale for Tungsten 

 and its Emissive Powers at Incandescent Tem- 

 peratures, " by A. G. Worthing. 



" 'Color Temperature' Scales for Tungsten and 

 Carbon," by Edward P. Hyde, E. E. Cady and 

 W. E. Eorsythe. 



"The Infra-red Spectra of the Alkaline Earth 

 Group," by H. M. Eandall. 



"The Pole Effect in a Calcium Arc," by Henry 

 G. Gale and Walter T. Whitney. 



"The Eeflecting Power of Alkali Metals in 

 Contact with Glass, as Determined by the Photo- 

 electric Cell," by J. B. Nathansen. 



"The Eefraetive Indices of Hydrogen and 

 Helium on Bohr's Theory," by C. Davisson. 



"A Photographic Study of the Diffraction Eing 

 System in the Shadow of a Sphere," by Mason B. 

 Hufford. 



Wednesday, December 29; 10 AM. 



"The Ionization Produced by a /3-partiele, " by 

 Alois F. Kovarik and L. W. McKeehan. 



"The Eole Played by Gases in Photo-Eleetrie 

 Discharge," by R. A. Millikan and Wilmer H. 

 Souder. 



' ' The Eelatiou between the Pressure Effect and 

 the Light Effect in Selenium Crystals," by E. O. 

 Dietrich. 



' ' On the So-called Magnetic Eays of Eighi, ' ' by 

 James E. Ives. 



"The Absorption Coefficients of various Metals 

 for High Frequency X-Eays," by S. J. M. Allen. 



' ' The Distribution of Energy in the X-Eay 

 Spectrum of Tungsten and Molbydenum at Con- 

 stant Potential, " by A. W. Hull. 



"The Emission Quanta of Characteristic X- 

 Eays, " by David L. Webster. 



' ' The Tribo-luminescence of Manganese-Zine 

 Compounds." With demonstration. By C. W. 

 Waggoner. 



"A New Law relating Ionization Pressure and 

 Current in the Corona of Constant Potentials, ' ' by 

 Earle H. Warner. 



"Arcs in Gases between Non-consuming Elec- 

 trodes," by G. M. J. Mackay and C. V. Ferguson. 



"The Hall Effect and Allied Phenomena in Bare 

 Metals and Alloys," by Alpheus W. Smith. 



"Mechanical and Acoustical Impedance, and 

 the Theory of the Phonograph," by A. G. Web- 

 ster. 



"Further Experiments on the Impedance of 

 Conical Horns," by A. G. Webster. 



' ' The Effect of Surface Films on Contact E. M. 

 F.'s," by E. A. MilUkan and Wilmer H. Souder. 



"A Eesonance Method for Measuring the Phase 

 Difference of Condensers," by H. L. Dodge. 



"The Magnetic Susceptibility of Oxygen," by 

 W. P. Eoop. (Eead by E. P. Lewis.) 



"An Unrecognized Error in the Measurement 

 of Magnetic Flux," by Arthur Whitmore Smith. 



"Unipolar Induction and Absolute Eotation," 

 by E. H. Kennard. 



"The Electrical Eesistanee of Vertically Sus- 

 pended Wires," by S. E. Williams. 



"A Simplified Apparatus for Measuring the 

 Conductivity of Electrolytes," by E. P. Hibbard. 



"Measurements of an Electric Current from its 

 Heating Effect," by S. Leroy Brown. 



' ' A Study of the Law of Response of the Sili- 

 con Detector," by Louise S. McDowell and 

 Frances G. Wick. 



' ' On the Free Vibrations of a Lecher System 

 IV.," by F. C. Blake and Charles Sheard. 



"Constant High Potential for X-Eay Work," 

 by Albert W. Hull. 



"Carbon Compression Eheostats, " by E. L. 

 Clark. 



' ' On the Theorem that all Action Eequires Ac- 

 tion at a Distance Somewheres, " by E. H. Ken- 

 nard. 



"The Black Body at the Melting Point of 

 Platinum as a Fixed Point in Photometry, ' ' by 

 Herbert E. Ives. 



' ' The Luminous Efficiency of the Carbon Incan- 

 descent Lamp and the Mechanical Equivalent of 

 Light," by Herbert E. Ives and E. F. Kingsbury. 



' ' The Mobility of Positive Ions, ' ' by Henry A. 

 Erikson. 



' ' The Hall Effect and Allied Phenomena in Tel- 

 lurium," by P. I. Wold. 



"A Wehnelt Cathode Eay Tube Magnetometer," 

 by C. T. Knipp and L. A. Welo. 



"An Investigation of the Acoustical Proper- 

 ties of the Armory at the University of Illinois," 

 by F. E. Watson. 



"New Electromagnetic Phenomena demon- 

 strated by Floating Sand Pebbles and other Non- 

 conductors in Acidulated Water, " by J. C. Lin- 

 coln. (By title.) 



' ' The Phonotrope, a New Instrument for find- 



