CONTENTS. Vll 



Page 

 Mr. W. H. L. Russell on the Calculation of the Potential of the Figure of 



the Earth 8 



Br. Stevelly on the application of D'Alemhert's Principle to the Rotation of 



a Rigid Mass 8 



Professor Sylvester on a Special Class of Questions on the Theory of Pro- 



bahilities 8 



on Professor Price's Modification of Arbogast's Method 9 



Light. 



Mr. A. Claudet on Moving Photographic Figures, illustrating some Pheno- 

 mena of Vision connected with the Combination of the Stereoscope and the 

 Phenakistoscope by means of Photography 9 



Mr. F. Galton on Spectacles for Divers, and on the Vision of Amphibious 



Animals 10 



Dr. J. H. Gladstone on the Refractive Equivalent of Carbon 11 



Mr. H. C. Sohby on a New Form of Spectrum-Microscope 11 



Heat. 



Principal Forbes's Experimental Inquiry into the Laws of the Conduction of 

 Heat in Bars, and into the Conductiug-Power of Wrought Iron 12 



Mr. W. J. Macqtjorn Rankine on the Second Law of Thermodynamics .... 13 



Electricity. 



Mr. W. Fairbairn on India-Rubber and Gutta Percha as Insulators for Sub- 

 marine Telegraphic Cables 14 



Mr. J. P. Gassiot on the Change of Form and Colour which the Stratified 

 Discharge assumes when a Varied Resistance is introduced in the Circuit of 

 an Extended Series of the Voltaic Battery 15 



Mr. R. Sabine on a New Method, introduced by Messrs. Siemens, for the 

 Measurement of Electrical Resistances 16 



Captain Selwyn on some New Arrangements of the Poles of Magnets 17 



Meteorology. 



Mr. F. W. Bbeabey's Remarks upon Aerial Navigation, suggested by Mr. 

 Glaisher's late Balloon Ascents 17 



Mr. J. B. Capello on the Great Storm of December 186-4, on the Coast of the 

 Peninsula 17 



Mr. J. Park Harbison on the Heat attained by the Moon under Solar Radi- 

 ation 17 



Mr. Alfred King on the Self-Registering Barometer at the Liverpool Obser- 

 vatory 18 



Mr. A. Follett Osler on an Anemometer for the Registration of Cyclones 

 or other Tropical Hurricanes 19 



Mr. T. L. Plant on the Anomalies of our Climate 19 



Mr. D. Smith on the Meteorology of Birmingham 19 



Mr. J. B. Capello and B. Stewart's Description of the Magnetic Storm of 

 the Beginning of August 1865, as recorded by the Self-recording Magneto- 

 graphs at the Kew and Lisbon Observatories 20 



Mr. W. Symons's Improved Standard Barometer 21 



