— 
lv CONTENTS OF VOL. VII.—SIXTH SERIES. 
Page 
Prof. A. Schuster on the Number of Electrons conveying the 
Conduction’Ourrents in Metals. \........20e5 eee 151 
Prof. E. Hagen and Prof. H. Rubens on some Relations 
between the Optical and the Electrical Qualities of Metals. 157 
Mr. Franz Leininger on the Relation of the Electric Charges 
transported by Cathode and Canal Rays to the Exciting 
RULPeNb ase ee be eee ae be ae oO 180 
Prof. Karl Pearson on a Novel Instrument for Drawing 
Parabolas.., (Plate XVi)'t... 2a, ....7.0 5a 200 
Profs. E. Rutherford and H. T. Barnes on the Heating Effect 
ot the Radium: Emanation ..........2...%40—— 202 
Contribution by Lord Kelvin to the Discussion on the Nature 
of the Emanations from Radium which was -opened by 
Professor E. Rutherford at the Meeting of the British 
Association last September °.... J... 0.0 [07 220 
Rev. P. J. Kirkby on the Effect of the Passage of Electricity 
through a Mixture of Oxygen and Hydrogen at Low 
Pressures. .00200. 00 UR SON 223 
Helitorial Note - 2.5 (4 (OUae PhS Ce aos 233 
Notices respecting New Books :— 
Dr. J. A. Fleming’s Handbook for the Electrical 
Laboratory and Testing Room, Volj iin... oe 233 
Prof. A. A. Michelson’s Light Waves and Their Uses .. 235 
Prof. E. Mathias’s Le Point Critique des Corps Purs .. 235 
Prof. A. Classen’s Ausgewihlte Methoden der Analyt- 
ischen Chemie, -Vol. TT. (02) .20 082 a ee ee 236 
Annuaire pour lan 1904) 2.0 22)... eee 236 
NUMBER XXXIX.— MARCH. 
Prof. J. J. Thomson on the Structure of the Atom: an 
Investigation of the Stability and Periods of Oscillation of 
a number of Corpuscles arranged at equal intervals around 
the Circumference of a Circle; with Application of the 
results to the Theory of Atomic Structure ............ 237 
Mr. O. W. Richardson on the Solubility and Diffusion in 
Solution of Dissociated Gases .......,.+.2.2.) «en 266 
Mr. J. RK. Cotter on an Instrument for Drawing Conics .... 274 
Prof. J. 8. Townsend on the Charges on Ions ..........-. 276 
Mr. R: Appleyard on the Conduetometer >... 722-0: .. see 281 
Mr. T. C. Porter on a Method of Mechanically Reinforcing 
Sounds: : (Plate: AVa.): «230 Penn oe 283 
Mr. S. Skinner on the Photographic Action of Radium Rays. 288 
Major 8. G. Burrard on Deflexions of the Plumb-line in 
Pda ek ae A, RR cee), eee 292 
Mr. P. E. B. Jourdain on the Transfinite Cardinal Numbers 
of Number-Classes in General*-:...¢62..<....) see eee 294 
Dr. J. Joly on the Motion of Radium in the Electric Field .. 3038 
