390 



SCIENCE 



[N. S. Vol. XLII. No. 1081 



accuracy. By studying the electrode phenom- 

 ena and other sources of error and correcting 

 them we have now reached a precision of 0.001 

 per cent, and an accuracy of about 0.01 per 

 cent. The details of all this work will appear 

 shortly in another article.* 



"W. A. Taylor 

 Department op Chemistry op 

 Forest Products, 

 University op Wisconsin 



PSOCEEDINGS OF THE AMESICAN FETS- 

 ICAL SOCIETY 



minutes op the SAN PRANCISCO MEETING 



The seventy-eighth meeting of the American 

 Physical Society was held at San Francisco, Au- 

 gust 2 to 7, 1915. It was a joint meeting with 

 Section B of the American Association for the Ad- 

 vancement of Science. The programs of the meet- 

 ing on Tuesday, Wednesday and Thursday were in 

 charge of the committee of the Pacific Coast di- 

 vision of the American Association for the Ad- 

 vancement of Science, of which Professor Fernando 

 Sanford was chairman, and those of Friday were 

 in charge of the Physical Society, President Mer- 

 ritt presiding. The meeting on Wednesday was 

 held at Stanford University, Palo Alto. All other 

 sessions for the reading of physics papers were 

 held at the physical laboratory of the University 

 of California, Berkeley. General sessions of the 

 American Association for the Advancement of 

 Science were held in San Francisco. 



The following papers were presented: 



Tuesday Afternoon — Spectroscopy 



(1) "A Summary of the Leading Features of 

 Electric Furnace Spectra"; (2) "The Spectrum 

 of the ' Tube-arc ' and a Comparison with Line Dis- 

 symmetries in Spark Spectra, ' ' by Arthur S. King. 



"Review of Laboratory Studies of the Zeemau 

 Effect, at Mount Wilson Solar Observatory," by 

 Harold D. Babeock. 



"Pole Effect in the Arc and Its Eolation to 

 Other Investigations," by Charles E. St. John and 

 Harold D. Babeock. 



' ' The Efficiency of Astronomical Spectro- 

 graphs," by Joseph Moore. 

 Wednesday Afternoon {at Stanford University) 



' ' Discussion and Demonstrations of High Poten- 

 tial Electric Currents," by Harris J. Ryan. 



* See Taylor 's address before the Physical Chem- 

 ical Section of the American Chemical Society, 

 New Orleans, April 1-3, 1915, and Physical Bevietc, 

 6, 61 (1915). 



Thursday Forenoon and Afternoon — Physics of the 

 Air 



"The Thunderstorm," by W. J. Humphreys. 



' ' New Concepts in Aerology, " by A. G. McAdie. 



"The Application of Physical Principles to 

 Problems Suggested by Oceanic Circulation and 

 Temperatures, ' ' by George F. MoEwen. 



' ' Radiation and the Atmosphere, ' ' by C. G. 

 Abbot. 



' ' Solar Radiation and Terrestrial Magnetism, ' ' 

 by L. A. Bauer. 



"On the Origin and Maintenance of the Earth's 

 Negative Charge, ' ' by W. F. G. Swann. 



"The Natural Charges of the Elements," by 

 Fernando Sanford. 



Friday Forenoon and Afternoon 



' ' Thermo-electric Properties of Alloys of Bis- 

 muth and Tin," by A. E. Caswell. 



' ' On the Free Vibrations of a Lecher System 

 IV." (By title.) By F. C. Blake and Charles 

 Sheard. 



"Resistance of a Spark Gap," by W. P. Boyn- 

 ton. 



' ' On the Resolving Power of Photographic 

 Plates," by Orin Tugman. 



' ' Sensitive Moving-coil Galvanometers, ' ' by 

 Frank Wenner and Ernest Weibel. 



' ' An Experimental Verification of the Law of 

 Variation of Mass with Velocity for Cathode 

 Rays," by Lloyd T. Jones. 



' ' The Oxide Resistance Thermometer, " by S. L. 

 Brown. 



"New Form of Radiation Pyrometer," by S. L. 

 Brown. 



' ' Electromotive Forces in Isothermal Metallie 

 Circuits," by Gilbert N. Lewis. 



' ' A New Method of Determining the Amplitude 

 of Sound Vibrations in Air with Demonstration," 

 by E. P. Lewis. 



' ' An Application of the Koch Registering Micro- 

 photometer for Measuring the Sharpness of Photo- 

 graphic Images, ' ' by Orin Tugman. 



' ' Photographic Study of the Tone of the Vio- 

 lin," by D. C. Miller. 



' ' The Variation of the Photoelectric Current with 

 the Angle of Emission, ' ' by Willard Gardner. 



' ' A Quantitative Determination of the Earth 's 

 Penetrating Radiation, " by C. H. Kunsman. 



"Ultra-violet Absorption Spectra," by R. L. 

 Sebastian. 



"The Ultra-violet Spectra of Krypton and 

 Xenon, " by E. P. Lewis. 



"The Law of Cohesion in Mercury," by P. A. 



