June 4, 1915] 



SCIENCE 



841 



both as a whole and in its separate parts. Their 

 conclusions that there are very appreciable mo- 

 tions in closely adjacent portions of the nebula 

 have been confirmed by observations made in the 

 last few weeks with the Bruce spectrograph. Dif- 

 ferences of over 10 km. per second in the velocity 

 in the line of sight have been found, and the gen- 

 eral effect of rotation of the nebula inferred by 

 the French observers is confirmed by the spectro- 

 graph. 



The Euler-Laplace Theorem on the Bounding Up 

 of the Orbits of the Heavenly Bodies under the 

 Secular Action of a Resisting Medium: T. J. J. 

 See. 



Horace Clark Eichards 



TBB AMEMICAN PSTSICAL SOCIETY 



A REGULAR meeting of the American Physical 

 Society was held at the National Bureau of Stand- 

 ards, Washington, on Friday and Saturday, April 

 23 and 24, 1915. 



y, 2 P.M. 



Hon. "William 0. Eedfield, Secretary of Com- 

 merce, opened the meeting with a cordial ad- 

 dress of welcome in which he gave strong expres- 

 sion to his interest in the progress of science, and 

 his appreciation of the vital interdependence of 

 physics and the commercial interests of the coun- 

 try. 



Papers were presented as follows: 



"On the Distributed Capacity of Single Layer 

 Solenoids," by J. C. Hubbard. (By title.) 



"The Skin Effect in Bimetallic Wires," by 

 John M. Miller. 



"Magnetization by Rotation," by S. J. Bar- 

 nett. 



"Intercomparisons of the Standard Instru- 

 ments at Magnetic Observatories 1905-1914," by 

 L. A. Bauer. 



"Simultaneous Eeadings in Electrical Meas- 

 urements, with Demonstration of a New Type of 

 Switch for Facilitating Them," by Walter P. 

 White. 



"The General Design of Critically Damped 

 Galvanometers," by Frank Wenner. (By title.) 



"Apparatus for the Simultaneous Measure- 

 ment of Length, Electrical Eesistanee, and Mag- 

 netic Permeability as Functions of the Tempera- 

 ture," by Arthur W. Gray. (By title.) 



' ' The Dielectric Constant of a Heterogenous Di- 

 electric," by H. L. Curtis and M. James. 



"The Separately Excited Electrodynamometer 



as a Sensitive Galvanometer," by Ernest Weibel. 



"The Crushing of a Hollow Conductor by 

 Lightning," by W. J. Humphreys. (By title.) 



"Aneroid Barometers," by M. D. Hersey. 



"A Method of Measuring Heat Conductivities," 

 by E. W. King. 



"Viscosity of Ethyl Ether near the Critical 

 Temperature," by A. L. Clark. 



"An Equation of State for Normal Substances, 

 Tested in the Vapor Dome," by Harvey N. Davis. 



"The Correction of Echoes in the Auditorium 

 at the University of Illinois," by F. E. Watson. 

 (By title.) 



"The Transpiration of Plants in Eelation to 

 Temperature and Solar Eadiation," by Lyman J. 

 Briggs and H. L. Shantz. 



"A Mercurial Barometer in which the Well 

 Setting is Eliminated," by Lyman J. Briggs. 



Saturday, 9:30 A.M. 



"The Eeflecting Power of Metals for the Ultra- 

 violet Eegion of the Spectrum," by Edward O. 

 Hulburt. 



"The Visibility of Eadiation in the Eed End of 

 the Visible Spectrum," by Edward P. Hyde and 

 W. E. Forsythe. 



"The Effective Wave-Length of Transmission 

 of Eed Pyrometer Glasses and other Notes on 

 Optical Pyrometry," by Edward P. Hyde, F. E. 

 Cady and W. E. Forsythe. 



"The Use of a Hollow Filament with Perfora- 

 tions in the Determination of the Black-body-Tem- 

 perature and True-Temperature Eelation for 

 Tungsten," by A. G. Worthing. 



"A Further Extension of the Spectrum in the 

 Extreme Ultra- Violet, " by Theodore Lyman. 



"The Fluorescence and Absorption Spectra of 

 Uranyl Nitrate," by E. L. Nichols and Ernest 

 Merritt. 



"A Precision Artificial Eye," by Herbert E. 

 Ives. (By title.) 



"A Flicker Photometer Attachment for a Lum- 

 nier-Brodhun Photometer Head," by E. F. Kings- 

 bury. 



"Color Grading and Color Specifications by 

 Means of the Eotary Dispersion of Quartz," by 

 Iiwin G. Priest and Chauucey G. Peters. (By 

 title.) 



"A Proposed Method for the Photometry of 

 Lights of Different Colors," by Irwin G. Priest. 



"On X-ray Wave-lengths," by William Duane 

 and F. L. Hunt. 



"The X-ray Speetrinn of Tungsten at Constant 

 Potential," by David L. Webster. 



