VI CONTENTS OF VOL. VII. FIFTH SERIES. 



Page 

 Dr. 0. J. Lodge on the Determination of the Variation of the 

 Thermal Conductivity of Metals with Temperature, by means 

 of the permanent Curve of Temperature along a uniform 



thin Eod heated at one end 251 



Prof. A. Steinhauser on the Theory of Binaural Audition. . . . 261 

 Mr. N. D. C. Hodges on a new Absolute Galvanometer .... 274 

 Professors W. E. Ayrton and J. Perry on a new Determina- 

 tion of the Eatio of the Electromagnetic to the Electro- 

 static Unit of Electric Quantity. (Plate XI.) 277 



Notices respecting New Books : — 



Mr, F. Eutley on the Study of Eocks, an Elementary 



Text-book on Petrology 289 



Annual Eeport of the Department of Mines, New South 



Wales, for the year 1877 290 



Proceedings of the Geological Society : — 



Messrs. Strahan and Walker on the Occurrence of Pebbles 

 with Upper-Ludlow Eossils in the Lower Carboniferous 



Conglomerates of North Wales 291 



Dr. H. Hicks on a New Group of Pre-Cambrian Eocks 



(the Arvonian) in Pembrokeshire 292 



Dr. H. Hicks on the Pre-Cambrian (Dimetian, Arvonian, 



and Pebidian) Eocks of Caernarvonshire and Anglesey 293 

 Prof. T. G. Bonney on the Quartz-felsite and associated 

 Eocks at the base of the Cambrian Series in North- 

 western Caernarvonshire 293 



Messrs. Bonney and Houghton on the Metamorphic 

 Series between Twt Hill, Caernarvon, and Port Di- 



norwic « 294 



Mr. F. Eutley on Perlitic and Spherulitic Structures in 



the Lavas of the Glyder Fawr, North Wales 294 



Mr. H. S. Poole on the Gold-leads of Nova Scotia .... 295 



On the Diffusion of Liquids, by J. Stefan 295 



On the Spectrum of Oxygen, and on the Electrical Luminous 

 Phenomena of Earefied Gases in Tubes with Liquid Elec- 

 trodes, by M. Paalzow 297 



NUMBEE XLIV.— MAT. 



Dr. G. Quincke on the Formation of Emulsions, and the Ac- 

 tion of the Bile in Digestion 301 



Capt. W. de W. Abney on the Photographic Method of Ee- 

 gistering Absorption-Spectra, and its Application to Solar 



Physics 313 



Dr. A. Schuster on Spectra of Lightning 316 



Mr. J. W. L. Glaisher on a Property of Vulgar Fractions . . 321 

 Mr. E. S. Brough on the proper Eelative Sectional Areas for 



Copper and Iron Lightning-Bods 336 



Mr. D. J. Blaikley's Experiments for determining the Correc- 

 tion to be added to the Length of a Cylindrical Eesonant 



