TEANSACTIONS OF THE SECTIONS. 



Section A.— MATHEMATICAL AND PHYSICAL SCIENCE. 



THURSDAY, SEPTEMBER 1, 



Page 

 Address by Professor Sir E. S. Ball, M.A., LL.D., F.R.S., F.RA.S., 



M.R.IA., Astronomer Royal for Ireland, President of the Section 669 



1. Third Report of the Committee for promoting Tidal Observations in 

 Canada 579 



2. Conduction of Electricity through Gases. By Professor A. Schuster, 

 Ph.D., F.R.S 580 



3. Instruments for Stellar Photography. By Sir HowAED Gettbb, F.R.S. ... 580 



4. On the Nature of the Photographic Star-Discs and the Removal of a 

 Difficulty in Measurements for Parallax. By Professor C. Peitchabd, 

 D.D., F.R.S 580 



5. On the Turbulent Motion of Water between Two Planes. By Professor 



Sir AV. Thomson, LL.D., F.R.S 581 



6. On the Theory of Electrical Endosmose and other Allied Phenomena, and 



on the Existence of a Sliding Coefficient for a Fluid in contact with a Solid. 

 By Professor IIoEAOE Lamb, M.A., F.R.S 581 



7. On the Vortex Theory of the Luminiferous ^ther. By Professor Sir 



W. Thomson, LL.D., F.R.S 581 



8. On the Ratio of the Two Elasticities of Air. By Professor Silvantjb P. 



Thompson, D.Sc 581 



9. A Null Method in Electro-ealorimetry. By Professor W. Steoud, D.Sc, 

 B.A., and W. W. Haldane Gee, B.Sc 581 



FRIDAY, SEPTEMBER 2, 



1. Fourth Report of the Committee for considering the best methods of re- 

 cording the direct Intensity of Solar Radiation 582 



2. Third Report of the Committee for considering the best means of ^com- 



paring and reducing Magnetic Observations 582 



3. New Electric Balances. By Professor Sir William Thomson, F.R.S. ... 582 



4. Supplement to a Report on Optical Theories. By R. T. Glazebeook, 

 M.A., F.R.S : 583 



5. Description of a Map of the Solar Spectrum. By Professor H. A. 



Rowland 583 



-C. Exhibition of Negatives of Photographs of the Solar Spectrum. By 



Geo. IIiqgs 583 



