CONTENTS OF VOL. XLII. FOURTH SERIES. V 



Page 

 Prof. J. D. Everett on the General Circulation and Distribution 



of the Atmosphere 199 



Prof. R. S. Ball's Account of Experiments upon the Resistance 



of Air to the Motion of Vortex-rings 208 



MM. A. de la Rive and E. Sarasin on the Action of Magnetism 



on Gases traversed by Electric Discharges 211 



Proceedings of the Royal Society : — 



Dr. W. Huggins on the Spectrum of Uranus and the Spec- 

 trum of Comet I., 1871 223 



Dr. J. H. Gladstone and Mr. A. Tribe on a Law in Che- 

 mical Dynamics 226 



Proceedings of the Geological Society : — 



Prof. A. C. Ramsay on the Red Rocks of England of older 



date than the Trias 228 



The Rev. P.|B. Brodie on the " Passage-beds" in the neigh- 

 bourhood of Woolhope, Herefordshire 231 



Mr. W. Whitaker on the Cliff-sections of the Tertiary Beds 



west of Dieppe in Normandy and at Newhaven in Sussex. 231 

 Prof. J. W. Dawson on New Tree Ferns and other Fossils 



from the Devonian 231 



On the Velocity of Propagation of Electrodynamic Effects, by 



Dr. Helmholtz 232 



On a Native Sulphide of Antimony from New Zealand, by M. M. 

 Pattison Muir, F.C.S., Student in the Laboratory of the An- 



dersonian University, Glasgow 236 



On the Reversal of the Lines of the Spectra of Metallic Vapours, 

 by M. A. Cornu 237 



NUMBER CCLXXX.- OCTOBER. 



Mr. J. Croll on Ocean-currents. — Part III. On the Physical 



Cause of Ocean-currents 241 



Archdeacon Pratt : the Solid Crust of the Earth cannot be thin. 280 

 Dr. E. Budde on the Action of Light on Chlorine and Bromine, 290 



Mr. J. W. L. Glaisher on a Class of Definite Integrals 294 



Prof. Challis on a new Method of solving some Problems in the 



Calculus of Variations, in reply to Professor Cay ley . , . . . . 302 

 Dr. T. E. Thorpe's Contributions to the History of the Phos- 

 phorus Chlorides 305 



Mr. J. Dalzell and Dr.T. E. Thorpe on the Existence of Sulphur 



Dichloride 309 



Prof. Cayley on Gauss's Pentagramma mirificum 311 



Notices respecting New Books : — 



Mr. H.W.Watson's Elements of Plane and Solid Geometry. 312 

 Mr. W. Crookes's Select Methods in Chemical Analysis 

 (chiefly Inorganic) 314 



