Februapa' ]2, 19]o] 



SCIENCE 



259 



cerned. Many other facts of interest besides 

 those above discussed have come to light in 

 our investigation, but the limited space of this 

 paper will not permit of their discussion, nor 

 of the submission here of the detailed data 

 which furnish tlie basis for the discussion 

 above given. 



C. B. LiPMAN, 



L. W. Fowler 



THE AMERICAN PSYSICAL SOCIETY 



The seventy-fifth meeting of the Physical So- 

 ciety was held in Eandall-Morgan Laboratory of 

 the University of Pennsylvania, December 29, 

 3934, to January 1, 3915. It was a joint meeting 

 with Section B of the American Association for 

 the Advancement of Science. Morning and after- 

 noon sessions were held on Tuesday, Wednesday 

 and Thursday. Vice-president Anthony Zeleny, of 

 Section B, presided on Tuesday and Wednesday 

 afternoons, and President Merritt at the other 

 four sessions. 



On Tuesday afternoon tlic program consisted of 

 the Vice-presidential Address before Section B on 

 '■' Recent Evidence for the Existence of the Nu- 

 cleus Atom, ' ' by A. D. Cole, and the presidential 

 address of the American Physical Society on 

 ' ' Liiminescence, ' ' by Ernest Merritt. On Wed- 

 nesday afternoon there was a symposium on the 

 Use of Dimensional Equations, led by E. Bucking- 

 ham, who was followed by A. C. Lunn, A. G. Web- 

 ster, W. S. Franklin and others. 



The following program of papeis was ]5re- 

 st'uted : 



"An A. C. Bridge for the Measurement of the 

 Dielectric Loss and Dielectric Constant at Higii 

 Voltages and Low Frequencies," by Chester A. 

 Butman. 



' ' Influence of the Concentration of Electrolyte 

 upon Electrode Potentials," by Arthur W. Ewell. 



"A New Method of Obtaining a Hysteresis 

 Loop," by W. N. Fenninger. 



' ' On Rotation and Magnetization, ' ' by S. .T. 

 Barnett. 



' ' Note on Thermo E.M.P. 's in which the Re- 

 sultant Peltier Effect is Zero," by H. C. Barker. 



"Linear Resistance Change with Temperature 

 of Certain Molten Metals," by E. F. Northrup. 



' ' The Effect of Temperature on the Dielectric 

 Strength, the Dielectric Loss and the Dielectric 

 Constant of Paraffine Oil," by Chester A. Butman. 



"A Preliminary Note on the Variation of 

 Stray Power Losses in a Dynamo," by W. N. 

 Fenninger. 



"Relation Between the Energy of the Cathode 

 Rays and the Frequency of the X-Eays Produced 

 by Them," by William Duane. 



"Thermionic Currents from a Wehuelt . Cath- 

 ode," by W. Wilson. 



' ' Mobility of Ions at Different Temperature 

 and Constant Gas Density," by Henry A. Erik- 

 son. 



' ' The Radioactive Content of Certain Minne- 

 sota Soils," by James C. Sanderson. (Read by 

 H. A. Erikson.) 



' ' Conducting Gas Layer at a Metallic Surface, ' ' 

 by G. W. Stewart. 



' ' X-Rays From the Electrical Discharge, ' ' by 

 Elizabeth R. Laird. 



"X-Bays Produced by Slow-moving Cathods 

 Rays," by Elizabeth E. Laird. 



"Light Due to Recombinatiou of Ions," by C. 



D. Child. 



' ' Electric Furnace Evidence on the Relation of 

 Spectrum Lines Having Constant Differences in 

 Wave-Number" (by title), by Arthur S. King. 



"The Mechanical Equivalent of Light," by H. 



E. Ives, W. W. Coblentz and E. P. Kingsbury. 

 "Fluorescence of the Uranyl Salts under X- 



Eay Excitation," by Frances G. Wick. 



' ' The Efficiency of Energy Transformation in 

 the Corona Method of Precipitating Fumes, ' ' by 

 W. W. Strong. 



"Leakage of Gas Through Quartz Tubes" (by 

 title), by E. C. Mayer. 



"A New Method for Measuring Gravity at Sea, 

 with Some Trans-Pacific Observations, ' ' by Ly- 

 man J. Briggs. 



"The Oxidation of Nitrogen," by W. W. 

 Strong. 



' ' The Alleged Dissymmetrical Broadening of 

 the D Lines of Sodium," by E. A. Eckhardt. 



"Exhibit of Mechanical Models Illustrating {a) 

 Subdivision of Alternating Current Between Two 

 Branches in Parallel, (6) The Alternating Cur- 

 rent Transformer, (c) Coupled Circuits in Wire- 

 less Telegraphy," by W. S. Franklin. 



' ' Some Causes of Variation in the Sensitivity 

 of Moving Coil Galvanometers," by Paul E. 

 Klopsteg. (Presented by A. Zeleny.) 



"A New Standard Phone and Pliouoraeter for 

 any Pitch, " by A. G. Webster. 



"A New Form of Radiation Pyrometer" (by 

 title), by S. Leroy Brown. 



' ' The Doppler Eft'ect in X-Ray Spectra and 

 Application to the Kinetic Theory of Solids," by 

 L. Gilchrist and D. A. Keys. 



"On Acoustic Impedence, and an Approximate 

 Theory of Conical Horns, " by A. G. Webster. 



"Vapors with Positive Specific Heat in Energy 

 Conversion" (by title), by J. E. Siebel. 



' ' Progress of' B-Particlcs through Matter, ' ' by 

 A. F. Kovarik and L. W. McKcehan. 



"A Thirty-two Element Harmonic Synthesizer," 

 by Dayton C. Miller. 



"The Result of Plotting the Separation of 

 Homologous Pairs against Atomic Numbers in- 

 stead of Atomic Weights," liy Herbert E. Ivss 

 and Otto Stuhlmaun. 



' ' Beaded Lightning, ' ' by W. J. Humphreys. 



"A Practical Measurement of Colors," by H. 

 E. Wetherill. 



' ' Preliminary Note on a Mercury-vapor Tube 



