VI CONTENTS OF VOL. III. FIFTH SERIES. 



Page 



Mr. M. M. Pattison Muir on Gallium 281 



Prof. J. Einerson-Reynolds's short Reports from the Chemical 

 Laboratory of Trinity College, Dublin (Nos. 2 and 3) .... 284 



Prof. J. Trowbridge on Liquid Vortex-Kings 290 



Proceedings of the Royal Society : — 



Prof. W. G. Adams and Mr. K. E. Day on the Action 



of Light on Selenium 295 



Lord Rayleigh on the Application of the Principle of 



Reciprocity to Acoustics 300 



Mr. J. G. Grenfell on Supersaturated Saline Solutions . . 304 

 Proceedings of the Geological Society : — 



The Kev. J. P. Twisden on possible Displacements of 

 the Earth's Axis of Eigure produced by elevations and 



depressions of her surface 311 



Mr. F. G. H. Price on the Beds between the Gault and 



Upper Chalk, near Folkestone ., 313 



On Diffusion and the Question, Is Glass Impervious to Gases ? 



by G. Quincke 314 



On Cosmic Vulcanism, by M. Tschermak 316 



Researches on Heat-Spectra, by P. Desains 318 



On the Polarized Light of the Rainbow, by Prof. J. Dechant. 319 

 On the Nature of Gas Molecules, by L. Boltzmann, of Graz. . 320 



NUMBER XIX.— MAT. 



Dr. J. Kerr on Rotation of the Plane of Polarization by Re- 

 flection from the Pole of a Magnet 321 



Mr. R. H. M. Bosanquet on the Theory of Sound 343 



Mr. O. J. Lodge's Reply to the Note of Professor M. Avenarius. 349 

 Mr. W. J. Lewis on Crystallographical Eorms of Glaucodote. 



(Plate I.) . . , 354 



Prof. A. Des Cloizeaux's Supplementary Note to his Memoir 



on Humite 357 



M. E. Bertrand on the Law of Twinning and Hemihedrism 



of Leucophane 357 



Mr. T. Muir on an Extension of a Theorem in Continuants, 



with an important application . . 360 



Dr. K. Heumann's Contributions to the Theory of Luminous 



Flames. (Plate II.) 366 



Messrs J. A. Wanklyn and W. J. Cooper on a Method of de- 

 termining the Amount of Proteine Compounds in Vege- 

 table Substances 3S2 



Notices respecting New Books : — 



Mr. G. K. Gilbert on the Colorado-Plateau Region consi- 

 dered as a Field for Geological Study 386 



Proceedings of the Royal Society : — 



Mr. J. Thomson's Experiments on Contact Electricity 

 between Non-Conductors 389 



