Tl CONTENTS OF VOL. XVIII. FIFTH SERIES. 



Page 

 Lt.-Col. H. H. Godwin- Austen on certain Tertiary For- 

 mations at the South Base of the Alps, in North Italy 383 

 Capt. F. W. Hutton on the Geological Position of the 



Weka-Pass Stone 383 



Mr. J. J. H. Teall on the Chemical and Microscopical 



Characters of the "Whin Sill 384 



Dr. G. W. Parker on the Geology and Mineralogy of 



Madagascar 385 



On the Infra-red Emission- Spectra of Metallic Vapours, by 



H. Becquerel 386 



Change in the Physical Properties of Bismuth when placed in 



a Magnetic Field, by M. Hurion 389 



On the Distance of the Poles of Magnets, by W. Hallock and 

 F. Kohlrausch 390 



NUMBER CXIV.— NOVEMBER. 



Dr. E. J. Mills on the Numerics of the Elements 393 



Dr. J. H. Jellett on Laplace's Equation 400 



Mr. J. A. Groshans on the Specific Gravity of certain Sub- 

 stances in the Solid State and in Aqueous Solution 405 



Dr. T. Muir on an overlooked Discoverer in the Theory of 

 Determinants 416 



F. Strenger on the Conductivity of Tourmaliue for Heat .... 427 



Mr. J. Hopps on the Alterations in the Electrical Resistances 

 of Metallic "Wires, produced by Coiliug and Uncoiling .... 433 



Prof. F. Kohlrausch on the Distance between the Poles of 

 a Magnet, the Coefficients of Temperature and Induction, 

 and on the Determination of Moments of Inertia by means 

 of Bifilar Suspension 446 



Prof. J. J. Sylvester on Hamilton's Quadratic Equation and the 

 general Unilateral Equation in Matrices 454 



Mr. A. Buchheim's Proof of Professor Sjdvester's " Third 

 Law of Motion " 459 



Notices respecting New Books : — 



Geology of Wisconsin. Survey of 1873-79. Vol. IV. . . 460 

 Mr. C. Smith's Elementary Treatise on Conic Sections ; 



and Elementary Treatise on Solid Geometry 464 



Mr. B. Williamson's Elementary Treatise on the Dif- 

 ferential Calculus, containing the Theory of Plane 

 Curves 465 



Determination of the Wave-lengths of the principal Lines and 

 Bands in the Infra-red Portion of the Solar Spectrum, by 

 M. Henri Becquerel 465 



Investigations on Radiant Heat, by H. Schneebeli 468 



On Mr. Moon's Method of Calculating the Ratio of the Two 

 Specific Heats of Gases, by Oliver J. Lodge 472 



