CONTENTS OF VOL. VI. FIFTH SERIES. 



NUMBER XXXVI.— SEPTEMBER. 



Page 



Mr. J. N. Lockyer on Eecent Researches in Solar Chemistry 161 



Mr. O. Heaviside on the Resistance o£ Telegraphic Electro- 

 magnets 177 



Mr. J. E. H. Gordon on the Effect of Variation of Pressure on 

 the Length of Disruptive Discharge in Air. (Plate III.) . . 185 



M. K. Zoppritz on Hydrodynamic Problems in reference to 

 the Theory of Ocean Currents 192 



Mr. R. Sabine on Motions produced by Dilute Acids on some 

 Amalgam Surfaces 211 



Mr. J. Ennis on the Origin of the Power which causes the 

 Stellar Radiations 216 



M. V. Dvorak on Acoustic Repulsion. With a Note by Prof. 

 A. M. Mayer 225 



Proceedings of the Geological Society : — 



Mr. C. Callaway on the Quartzites of Shropshire 233 



Prof. Prestwich on Artesian Wells 234 



On some Problems of the Mechanical Theory of Heat, by Prof. 

 Ludwig Boltzmann 236 



On the Relation of the Work performed by Diffusion to the 

 Second Proposition of the Mechanical Theory of Heat, by 

 Prof. R. Clausius 237 



On Mosandrum, a New Element, bv J. Lawrence Smith .... 238 



NUMBER XXXVIL— OCTOBER. 



The Rev. J. E. Blake on the Measurement of the Curves 

 formed by Cephalopods and other Mollusks. (Plate IV.) . . 241 



Prof. H. Hennessy on the Limits of Hypotheses regarding the 

 Properties of the Matter composing the Interior of the Earth 263 



Mr. A. M. Worthington on the Blue Colour of the Sky 267 



Lord Rayleigh on Acoustic Repulsion 270 



Prof. S. P. Thompson on certain Phenomena accompanying 

 Rainbows . 272 



Dr. R. S. Ball on the principal Screws of Inertia of a Free or 

 Constrained Rigid Body 274 



Prof. W. C. Unwin on the Discharge of Water from Orifices 

 at different Temperatures 281 



Messrs. J. A. Wanklyn and W. J. Cooper on the Action of 

 Alkaline Solution of Permanganate of Potash on certain 

 Gases 288 



Prof. E. Edlund's Researches on Unipolar Induction, Atmo- 

 spheric Electricity, and the Aurora Borealis. (Plate VIII.) 289 



