PROCEEDINGS OF 

 THE ROYAL SOCIETY. 



VOL. XXIX. f ^ 9£>No. 198 



CONTENTS. 



November 20, 1879. 



PAGE 



I. Experimental Researches on the Electric Discharge with the Chloride 

 of Silver Battery. By Warren De La Hue, M.A., D.C.L., F.R.S., 

 and Hugo W. Muller, Ph.D., F.R.S 281 



II. Researches on the Action of Organic Substances on the Ultra- Yiolet 

 Rays of the Spectrum. Part III. On Examination of Essential 

 Oils. By W. H". Hartley, F.R.S.E., &c, Professor of Chemistry in 

 the Royal College of Science for Ireland, Dublin, and A. K. Hunt- 

 ESfGTOH, E.I.C., E.C.S., Associate of the Royal School of Mines . 230 



III. Preliminary Xote on Magnetic Circuits in Dynamo- and Magneto-Elec- 



tric Machines. By Lord Elphinstone and Charles W. Vincent, 

 F.R.S.E., F.C.S., F.I.C. . . 292 



IV. Further particulars of the Transit of Yenus across the Sun, December 9, 



1874 ; observed on the Himalaya Mountains, Mussoorie, at Mary- 

 Villa Station, Lat. 30° 28' X., Long. 78° 3' E., height above sea 6,765 

 feet, with the Royal Society's 5-inch Equatoreal. Xote III. By J. 

 B. N. Hennessey, F.R.S 2[tf 



V. Preliminary Report to the Committee on Solar Physics on rhe evidence 

 in favour of the Existence of certain Short Periods common to Solar 

 and Terrestrial Phenomena. By Balfour Stewart, F.R,S., Pro- 

 fessor of Natural Philosophy in Owens College, Manchester, and 

 William Dodgson 303 



VI. On the Solubility of Solids in Grases. By J. B. Hannay, F.R.S.E., 



F.C.S., and James Hogarth 321 



VII. On the Action of Nuclei in producing the Sudden Solidification of Su- 

 persaturated Solutions of dauber's Salts. By Charles Tomlinson, 

 F.R.S. . 326 



VIII. On Definite Integrals involving Elliptic Functions. By J. W. L. 



G-laisher, M.A., F.R.S. , Fellow of Trinity College, Cambridge . 331 



IX. Values of the Theta and Zeta Functions for certain Values of the Ar- 

 gument. By J. W. L. G-laisher, M.A., F.R.S., Fellow of Trinity 

 College, Cambridge . . 351 



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