IV CONTENTS OF VOL. XXVI.— FOURTH SERIES. 



Page 



Mr. G. Gore on the Adhesion of Liquids to Mercury 142 



Mr. P. G. Tait on the Conservation of Energy 144 



Mr. J. P. Joule on the Dynamical Theory of Heat 145 



Proceedings of the Royal Society : — 



Mr. W. Lassell's Observations made at Malta on a Planetary 



Nebula 147 



The Rev. S. Haughton on the Tides of the Arctic Seas . . 149 

 The Astronomer Royal on the Strains in the Interior of 



Beams 149 



Messrs. Bunsen and Roscoe's Photochemical Researches. . 151 

 Proceedings of the Geological Society : — 



Sir R. I. Murchison on the Gneiss and other Azoic Rocks, 

 and on the superjacent Palaeozoic Formations of Bavaria 



and Bohemia » . 155 



Mr. R. Lightbody on a Section at Moktree 157 



The Rev. O. Fisher on the Brick-pit at Lexden, near Col- 

 chester 157 



Mr. H. C. Sorby on the original nature and subsequent 



alteration of Mica-schist 157 



Mr. P. M. Duncan on the Fossil Corals of the West Indies. 157 

 On an Apparatus for the Statical Measure of Gravity, by John 



Allan Broun 158 



On Electric Induction in the Pyrenees, by C. Packe, Jun., Esq. 160 



NUMBER CLXXIV.— SEPTEMBER. 



o 



M. J. A. Angstrom on the Conducting- Power of Copper and 



Iron for Heat at different Temperatures 161 



Prof. Sylvester on the Centre of Gravity of a Truncated Trian- 

 gular Pyramid, and on the Principles of Barycentric Per- 



. spective 167 



M. P. J. M. Sanna-Solaro on the Artificial Production of Hail, 



and on a new Theory of this Meteoric Product , 184 



Mr. C. Tomlinson on the Action of Oils in arresting the Motions 



of Camphor on Water 187 



Dr. G. Quincke on the Position of the Oscillations of the 



^Ether-particles in a Rectilinearly Polarized Ray of Light . . 190 

 Captain Noble on the Ratio between the Forces tending to pro- 

 duce Translation and Rotation in the Bores of Rifled Guns. 195 



M. L. Lorenz on the Theory of Light 205 



Mr. B. Stewart on the Radiation and Absorption of Gases. . . . 219 

 Mr. J. Cockle's Concluding Remarks on a recent Mathematical 



Controversy 223 



Proceedings of the Royal Society : — 



Mr. F. Galton on the Theory of Cyclones 225 



Prof. W. H. Miller on the Form of Crystals of Peroxide of 



Benzoyle 227 



Prof. W. A. Miller on the Spectrum of Thallium ...... 228 



