CONTENT?. Xlii 



Page 



2. On the Electric Conductivity of Bismutli and Copper in Magnetic Fields. 



By Dr. W. Peddte, F.R.S.E 641 



3. The Application of Interference Methods to Spectroscopic Measurement. 



By Professor A. Michelson 641 



4. Photographs of Electrical Discharges. By A. A. Campbell Swinton 641 



5. Slow Oscillations produced on discharging Electric Condensers of great 

 Capacity. By Jajies H. Geay, M.A., B.Sc 642 



6. Inducto-Script. By Rev. Fredeeick J. Smith, M.A 644 



7. On a Periodic Effect which the Size of Bubbles has on the Velocity of their 

 Ascent in Vertical Tubes containing Liquid. By Feed. T. Teouton, M. A., 

 D.Sc 645 



8. Experiments on Flame Spectra. By Professor Aethttb Smithells, B.Sc. 645 



Department II.— Mathematics. 



1. Models of Mathematical Surfaces. By Professor A. Ceum Brown, F.R.S., 

 F.R.S.E 646 



2. Interim Report of the Committee on Tables of Mathematical Functions... 646 



3. Interim Report of the Committee on Tables connected with the Pellian 

 Equation 646 



4. Note on the Glissettes of an Ellipse and of a Hyperbola. By Professor P. 



G. Tait, Sec.R.S.E 646 



5. A Curious Point connected with the Parallel Axiom. By Professor 

 Chetstal 647 



6. On Conjugate Circle Groups. By Lieut.-Col. Allan Cunningham, R.E. 647 



7. A Method of Finding the Logarithms of Large Numbers. By the Rev. 



Dr. T. Smith 647 



JUO^'BAY, AUGUST 8. 



1. Report of the Committee on the Ultra-Violet Rays of the Solar Spectrum 647 



2. On the Construction of the New Physical Laboratory at Groningen, Hol- 

 land. By Professor P. H. Schotjte 647 



3. Report of the Committee on Measuring Optical Constants 647 



4. On a Method of Determining Thermal Conductivities. By Charles H. 

 Lees, M.Sc 647 



5. Interim Report of the Committee on a National Physical Laboratory 648 



6. A Discussion on a National Physical Laboratory, opened by Professor 

 Oliver J. Lodge, F.R.S 648 



7. On Graphic Solution of Dynamical Problems. By Lord Kelvin, Pres.R.S. 648 



8. Reduction of every problem of Two Freedoms in Conservative Dynamics, 

 to the drawing of Geodetic Lines on a Surface of given Specific Cur- 

 vature. By Lord Kelvin, Pres.R.S 652 



TUESDAY, AUGUST 9. 



1. Report of the Committee on Electrolysis 653 



2. Report of the Committee on the Discharge of Electricity from Points 663 



3. A Magnetic Curve Tracer. By Professor J. A Ewing, F.R.S 653 



