1912.] MINUTES. XV 



"Thermal Relations of Solutions," by William F. Magie, M.A., 

 Ph.D., Professor of Physics, Princeton University. 



"The Measurement of Temperature up to 1750° C." (illus- 

 trated), by Arthur L. Day, B.A., Ph.D., Director of the 

 Geophysical Laboratory of the Carnegie Institution. 



" Selective Scattering Reflection and Absorption by Resonating 

 Gas Molecules" (illustrated), by Robert Williams Wood, 

 LL.D., Prof, of Experimental Physics, Johns Hopkins Univ. 



" Some Observations on the Transmission of Sound through 

 Walls," by Arthur Gordon Webster, Ph.D., LL.D., Professor 

 of Physics, Clark University, Worcester, Mass. 



"New Magnetic Charts of the Indian Ocean" (illustrated), by 

 Louis A. Bauer, C.E., Ph.D., Director of the Department of 

 Terrestrial Magnetism of the Carnegie Institution. 



" The Treaty-Making Power of the LTnited States and the 

 Methods of its Enforcement as Affecting the Police Powers 

 of the States," by Charles H. Burr, of Philadelphia, the 

 Essay to which the Henry M. Phillips Prize was awarded. 



Afternoon Session — 2 o'clock. 



Edward C. Pickering, Sc.D., LL.D., F.R.S., Vice-President, 



in the Chair. 



Prof. B. Osgood Pierce, a recently elected member, and Dr. 

 Arthur Louis Day and Prof. Frank Schlesinger, newly elected mem- 

 bers, signed the Laws and were admitted into the Society. 



The following papers were read : 



" Symposium on Stellar Spectroscopy " : 



"Radial Velocity" (illustrated), by William W. Campbell. 

 Sc.D., LL.D., Professor of Astronomy, Lick Observa- 

 tory, LTniversity of California. 



"Objective Prism Spectra," by Edward C. Pickering, Sc.D., 

 LL.D., Professor of Astronomy, Harvard University. 



" The New Star in Gemini," by Storrs B. Barrett, of the 

 Yerkes Observatory, Williams Bay, Wisconsin. (In- 

 troduced by Edward B. Frost, D.Sc.) 



