1 PROCEEDINGS OF 

 THE ROYAL SOCIETY. 



vol. xxix. „ No. 196. 



<v \ h ) CONTENTS. 



May 1, 1879. ^ A . . 



List of Candidates for Election ^^/"'Tsos^ V 



I. A Magnetic Survey of the Fortieth Parallel in North America between 

 the Atlantic Ocean and the Great Salt Lake, Utah. By T. E. Thoepe, 

 Ph.D., F.R.S., Professor of Chemistry, Yorkshire College, Leeds . . 1 

 II. On Certain Definite Integrals occurring in Spherical Harmonic Analysis, 

 and on the Expansion in Series of the Potentials of the Ellipsoid and 

 of the Ellipse. By W. D. Niyen, M.A., Fellow of Trinity College, 

 Cambridge . . . . . . . . . .2 



III. On the Origin of the Parallel Roads of Lochaber, and their bearing on 

 other Phenomena of the Glacial Period. By Joseph Prestwich, M.A., 

 F.R.S., F.G.S., &c, Professor of Geology in the University of Oxford . 6 



May 8, 1879. 



I. On the Sensitive State of Electrical Discharges through Rarefied Gases. 

 By William Spottiswoode, P.R.S., and S. Fletcher Moulton, late 

 Fellow of Christ's College, Cambridge ....... 21 



II. On the Action of Solid Nuclei. By Chaeles Tomlinson, F.R.S. . . 24 



III. On the Results of the Magnetical Observations made by the Officers of the 



Arctic Expedition, 1875-76. By Staff-Commander E. W. Creak, R.N., 

 attached to the Admiralty Compass Department . .... 29 



IV. On the Relation between the Diurnal Range of Magnetic Declination and 



Horizontal Force, as observed at the Royal Observatory, Greenwich, 

 during the years 1841 to 1877, and the Period of Solar Spot Frequency. 

 By William Ellis, F.R.A.S., Superintendent of the Magnetical and 

 Meteorological Department. Royal Observatory, Greenwich . . .43 



May 15, 1879. 



I. Note on a recent Communication by Messrs. Liveing and Dewar. By 



J. Norman Lockyeb, F.R.S. . . . . . . . .45 



II. Sur la Limite Ultraviolette du Spectre Solaire. Par Mons. A. Coenu . 47 



III. On an Induction- Currents Balance, and Experimental Researches made 



therewith. By Professor D. E. Hughes . . . . .56 



IY. Some Researches with Professor Hughes' new Instrument for the Measure- 

 ment of Hearing : the Audiometer. By Benjamin Waed Richardson, 



M.D., LL.D., F.R.S .65 



V. Note on the Invention of a Method for making the Movements of the 

 Pulse Audible by the Telephone : the Sphygmophone. By Benjamin 

 Waed Richaedson, M.D., LL.D., F.R.S 70 



VI. On the Capillary Phenomena of Jets. Ry Lord Rayleigh, F.R.S. . . 71 



For continuation of Contents see 4th page of the Wrapper. 



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