CONTENTS OF VOL. XXIX. — FOURTH SERIES. y 



Page 



Dr. C. K. Akin on the Conservation of Force 205 



Prof. Favre on the Origin of the Alpine Lakes and Valleys . . 206 

 Prof. Bonn on the History of Conservation of Energy, and of its 



application to Physics 215 



Prof. Tyndall on the History of Calorescence 218 



Prof. Cayley's Note on Lobatschewsky's Imaginary Geometry. 231 

 Proceedings of the Royal Society : — 



Mr. H. E. Roscoe on a Method of Meteorological Regis- 

 tration of the Chemical Action of Total Daylight .... 233 

 Messrs. De la Rue, Balfour Stewart, and Benjamin Loewy 



on the Nature of Solar Spots 237 



Proceedings of the Geological Society : — 



Mr. W. Keene on the Coal-measures of New South Wales, 



with Spirifers, Glossopteris, and Lepidodendron 239 



Mr. S. V. Wood jun., on the Drift of the East of England 



and its Divisions 240 



Proceedings of the Royal Institution : — 



Prof. Tyndall on Combustion by Invisible Rays 241 



On the Heating of the Glass Plate of the Leyden Jar by the 



discharge, by Dr. Werner Siemens 244 



Letter from Sir J. F. W. Herschel, Bart., in reference to a 



recent Communication from Dr. J. Davy, &c. &c 246 



On Lunar Influence over Temperature, by J. Park Harrison . . 247 

 On the Electrical Standard, by Fleeming Jenkin 248 



NUMBER CXCVL— APRIL. 



Mr. W. G. Adams on the Application of the Principle of the 



Screw to the Floats of Paddle-wheels 249 



Mr. G. C. Foster on Chemical Nomenclature, and chiefly on 



the use of the word Acid 262 



Dr. H. W. Schroder van der Kolk on the Mechanical Energy 



of Chemical Actions „ . 269 



Dr. Rankine on the Elasticity of Vapours 283 



Mr. A. C. Ramsay on the Glacial Theory of Lake-Basins .... 285 

 Mr. J. H. Cotterill on an Extension of the Dynamical Principle 



of Least Action , 299 



Dr. Atkinson's Chemical Notices from Foreign Journals .... 305 

 Prof. Wanklyn on the Constitution of Chromium-Compounds 313 

 Proceedings of the Royal Institution : — 



Dr. W. Odling on Aluminium Ethide and Methide 316 



Proceedings of the Royal Society : — 



Mr. W. Huggins on the Spectrum of the Great Nebula in 



the Sword-handle of Orion 319 



Dr. John Phillips on the Planet Mars 322 



Proceedings of the Geological Society : — 



The Rev. P. B. Brodie on the Lias Outliers at Knowle and 

 Wootton Waven in South Warwickshire 325 



