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VI CONTENTS OF VOL. XLIX. FOURTH SERIES. 



Page 

 Dr. H. F. Weber on the Specific Heat of the Elements Carbon, 

 Boron, and Silicon. — Part I. The Eelation between the 

 Specific Heat of these Elements in the free state and the 



Temperature 276 



Mr. C. Tomlinson on the Action of Solids in liberating Gas 



from Solution 302 



Mr. J. W. L. Glaisher on Partitions 307 



Lord Bayleigh on the Work that may be gained during the 



Mixing of Gases 311 



Notices respecting New Books : — 



Mr. B. Williamson's Elementary Treatise on the Integral 

 Calculus, containing Applications to Plane Curves and 



Surfaces, with numerous Examples 319 



Proceedings of the Eoyal Society : — 



Mr. J. N. Lockyer on the Molecular Structure of Vapours 



in connexion with their Densities 320 



Mr. J. N. Lockyer on a new Class of Absorption Pheno- 

 mena 323 



Mr. J. N. Lockyer's Eesearches in Spectrum- Analysis in 



connexion with the Spectrum of the Sun 326 



Procedings of the Geological Society : — 



Mr. T. P. Jamieson on the last Stage of the Glacial Period 



in North Britain 326 



The Bev. T. G. Bonney on the Upper Engadine and the 



Italian Valleys of Monte Bosa 327 



Mr. W. Whitaker on the occurrence of Thanet beds and 



of Crag at Sudbury, Suffolk 328 



Mr. J. W. Hulke on a Dinosaurian ilium indicative of 



a new genus, or possibly of a new order of Beptiles . . 328 

 Mr. J. W. Hulke on a Beptilian Tibia and Humerus from 



the WealdenPormation in the Isle of Wight 329 



On the Magnetizing-f unction of Tempered Steel, by E. Bouty. 329 

 On the dependence of the Coefficient of Eriction of Atmo- 

 spheric Air on Temperature, by Albert von Obermayer, Cap- 

 tain of Artillery * 332 



On Camacho's New Electromagnet, by B. S. Culley, Esq. . . 332 



NUMBEE CCCXXVI.— MAY. 



M. E. Goldstein on Spectra of Gases 333 



Mr. W. H. Walenn on Unitation. — III. The Unitates of 



Powers and Boots 346 



Prof. A. M. Mayer's Eesearches in Acoustics. — No. VI 352 



Dr. A. H. Curtis on Extraordinary Eeflection 366 



Prof. G. C. Poster on Graphical Methods of solving certain 



simple Electrical Problems. (With a Plate.) 368 



