CONTENTS. 



3. Electrolytic Problems. By Robert L. MoND 564 



4. On Clausius' Theory of Electrolytic Conduction, and on some Secret 

 Evidence for (he Dissociation Theory of Electrolysis. By J. Brown ... oG4 



5. Report of the Committee on the Phenomena accompanying the Discharge 



of Electricity from Points 565 



6. On the Electrification of Needle Points in Air. By A. P. Chattock 5G5 



7. On the Measurement of Liquid Resistances. By J. Swinburne 565 



8. The Surface-Tension of Ether and Alcohol at Different Temperatures. 



By Professor William Ramsay, Ph.D., F.R.S 565 



Department II. — Mathematics. 



1. Interim Report of the Committee on Mathematical Functions 566 



2. Interim Report of the Committee on the Pellian Equation Tables 566 



3. On Periodic Motion of a Finite Conservative System. By Sir William 

 Thomson, Pres.R.S 5G6 



4. On a Geometrical Illustration of a Dynamical Theorem. By Sir Robert 

 Ball, F.R.S 566 



5. On the Transformation of a Differential Resolvent. Bv the Rev. Robert 

 Haelet, M.A., F.R.S .' 566 



G. On the Transformations used in connection with the Duality of Differential 

 Equations. By E. B, Elliott, F.R.S r,(\< 



7. Note on a Method of Research for Invariants. By E. B. Elliott, F.R.S. 568 



8. On Liquid Jets under Gravity. By Rev. H. J. Sharbe, M.A 668 



0. The Geometry of Confocal Conies. By Professor T. C. Lewis 570 



10. Some Tangential Transformations, including Laguerre's Semi-Droites 



R&iproques. By Professor R. W. Genese, M.A 571 



11. Note on the Normal to a Conic. By R. H. Pinkerton 572 



12. On the Importance of the Conception of Direction in Natural Philosophy. 



By E. T. Dixon *_ ; 572 



JUOJVBAY, AUGUST 24. 



1. Report^of the Committee on Researches on the Ultra-Yiolet Ravs of the 

 bolar Spectrum • k^o 



2. Comparison of Eye and Hand Registration of Lines in the Violet and 



Ultra-Violet of the Solar Spectrum, against Photographic Records of 

 the same, with the same Instrument, after a lapse of several vears. By 

 C. Piazza Smtth, LL.D., F.R.S.E ... ' 573 



3. Note on Observing the Rotation of the Sun with the Spectroscope. By 



G. JouNSTONE Signet, M.A., D.Sc, F.R.S "oi-"i'e- ^y ^^^ 



*■ ^Lt'S'lF.S"^^" ^'"'' '"^ ^P''*'^- By G.Johnstone Stoney, _ 



o74 



5. Seventh Report of the Committee on Solar Radiation 



C. Report of the Committee on Meteorological Photography 



0/0 



575 



