590 



SCIENCE 



[N. S. Vol. XXXI. No. 798 



produce the phenomenon without demanding a 

 larger motion of the lunar perigee than observa- 

 tion warrants. On the border line between two 

 sets of hypotheses was a curious fact, namely, 

 that if the period of the solar rotation coincided 

 very nearly with one of the principal lunar periods 

 a minute equatorial ellipticity of the sun's mass 

 was sufficient to explain the term. So far as 

 known, these hypotheses do not conflict with any 

 observed phenomena, but they cause some theoret- 

 ical difficulties. 



PEOGKAM OF THE JOINT SESSION OF SECTION B AND 

 SECTION L, FEIDAT MOBNINQ, DECEMBEB 21 



The Relation of Colleges to Secondary Schools 

 with respect to Physics: Professor E. H. HAii, 

 of Harvard University. 

 What Specialization has done for Physics Teach- 

 ing: Professor John F. Woodhtju,, Teachers 

 College, Columbia University. 

 The Quantitative Teaching of Kinetics in Sec- 

 ondary Schools: N. H. Black, of Roxbury Latin 

 School, Boston. 

 The Place of " g " in High School Teaching and 

 other Topics: Professor A. G. Websteb, of 

 Clark University. 

 College Attitude toward Preparatory Work: Pro- 

 fessor C. R. Mann, University of Chicago. 

 These papers were followed by an animated 

 general discussion in which the following educa- 

 tors participated: Professors Guthe, of the Uni- 

 versity of Michigan; Hall, of Harvard; Franklin, 

 of Lehigh; President McNair, of Michigan School 

 of Mines; Professors Webster, of Clark; Woodhull, 

 of Columbia; Mann, of Chicago; Hull, of Dart- 

 mouth; Rosa, of the Bureau of Standards, and 

 Slate, of the University of California. 



At the joint sessions of the American Physical 

 Society and Section B, the following forty-nine 

 papers were presented. Abstracts of many of 

 these papers may be found in the February num- 

 ber of the Physical Review and others may be 

 expected in later numbers of the same periodical. 

 Temperature Coefficient of Electrical Resistance — 

 Tungsten, Molyidenum, Nickel and Nichrome: 



A. A. SOMEEVILLE. 



The Flow of a Gas through a Capillary Tuie: 



WiLLAED J. FiSHEE. 



Effect of Surface Tension upon a Falling Jet of 

 Water: F. R. Watson. 



The Variation of the Sail Effect in Metals %oith 

 Change of Temperature: At.pheus W. Smith. 



The Effect of Pressure on the Electrolytic Recti- 

 fier: A. P. Cabman and G. J. Balzeb. 



The Analysis of the Principal Mercury Lines iy 

 Diffraction Gratings and a Comparison with the 

 Results obtained by other Methods: Heney G. 

 Gale and Haevey B. Lemon. 



The Spectra of some Gases in the Region of Ex- 

 tremely Short Wave-length: Theodoeb Lyman. 



The Variation of the Hall Effect mth the Tem- 

 perature in the Case of the Principal Magnetic 

 Metals: Thomas C. McKay. 



The Rectifying Effect in Point ami Plane Dis- 

 charge: RoBEET F. Eaehaet and Chas. H. Lake. 



Photographic Photometry, and some Interesting 

 Photographic Phenomena: Chaeles F. Beush. 



Note on " Clianges in Density of the Ether, and 

 some Optical Effects of Changes in Ether 

 Density " : Chaeles F. Beush. 



The Tone Quality of the Flute: D. C. Millee. 



An Instrument for Projecting and Recording 

 Sound Waves: D. C. Millee. 



The Magnetic Measurements on Board the " Car- 

 negie " in 1909 : L. A. Baueb. 



The Relativity Dilemma: D. F. Comstock. 



" Bound Mass " and the Fitzgerald-Lorentz Con- 

 traction: Will C. Bakee. 



Physical Properties of Binary Liquid Mixtures: 



J. C. HUBBAED. 



On the Use of Polar Coordinates in Thermody- 

 namics: J. C. HUBBABD. 



The Theory of the Vibration Galvanometer: P. 

 Wennee. 



Coefficients of Linear Expansion at Low Tem- 

 peratures: H. G. DOBSEY. 



The Freezing of Mercury at High Pressures: P. 

 W. Beidgeman. 



Phenomena of Spark Discharge through Wire 

 Conductors : Feancis &. Niphee. 



Some Minute Phenomena of Electrolysis: H. W. 



MOESE. 



A New Method of Measurement of Small Angles: 

 C. W. Chambeelain. 



The Photographic Evidence for Dispersion of 

 Light in Space — 7s it a purely Photographic 

 Phenomenon? H. E. Ives. 



On the Secondary j3 Radiation from Solids, Solu- 

 tions and Liquids: S. J. Allen. 



The Effect of Filter Paper upon the Mass and 

 Form of the Deposit, in tlie Silver Goniometer: 

 E. B. Rosa, G. V. Vinal and A. S. McDaniel. 



Experiments in Impact Excitation until the Lepel 

 Singing Arc: Geoege Nasmtth. 



On the Coefficients of Diffusion of the Emanation 

 and the Active Deposit Particles of Actinium: 

 J. C. McLennan. 



