CONTENTS of N° 211.— Fourth Series. 



XIV. Experimental Researches in Magnetism and Electricity. — 

 Second Series. By H. Wilde, Esq. (With a Plate) page 81 



§ 3. On the Electric Condition of the Terrestrial Globe, and on 



the Absolute Character of the Law of Definite Electrolysis . . 81 

 § 4. On the Transmutable Nature of Water 106 



XV. On the Theory of Pressure in Fiuids. By R. Moon, M.A., 

 Honorary Fellow of Queen's College, Cambridge 116 



XVI. On the Diammonic Carbonate, or Normal Carbonate of Am- 

 monium. By Edward Divers, M.D., F.C.S., Lecturer on Natural 

 Philosophy, Charing Cross Hospital 125 



XVII. On a modified Spectroscope for use in the examination of Mi- 

 nerals. By J. Emerson Reynolds, Member of the Royal College of 

 Physicians, Edinburgh, Keeper of the Minerals and Analyst to the 

 Royal Dublin Society 129 



XVIII. The Internal Motions of Gases compared with the Motions 



of Waves of Light. By G. Johnstone Stoney, M.A., F.R.S 132 



XIX. On Geological Time, and the probable Date of the Glacial 

 and the Upper Miocene Period. By James Croll, of the Geological 

 Survey of Scotland ' 141 



XX. Proceedings of Learned Societies : — 



Royal Society : — Mr. R. Moon on the Impact of Compressible 

 Bodies, considered with reference to the Theory of Pressure. . 154 



Geological Society: — Mr. G. Maw on the Disposition of Iron 

 in Variegated Strata ; Dr. Holl on the older Rocks of South 

 Devon and East Cornwall 157-158 



XXI. Intelligence and Miscellaneous Articles: — 



On Secondary Currents and their Applications, by M. G. Plante. 159 

 On the Formation of Peroxide of Silver by Ozone, by F.Wohler. 160 



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 post-paid, to the Care of Messrs. Taylor and Francis, Printing Office, Red 

 Lion Court, Fleet Street, London. 



