CONTENTS OF VOL. XLII. FOURTH SERIES. .Vll 



Page 



Pro£ R. Harkness and Mr. H. Hicks on the ancient Rocks 

 of the St. David's Promontory, South Wales, and their 



Fossil contents 386 



Mr. R. Tate on the Age of the Nubian Sandstone 388 



Mr. W. B. Dawkins on the Discovery of the Glutton (Gulo 



luscus) in Britain 388 



Mr. J. L. Lobley on the principal Features of the Strati- 

 graphical Distribution of the British Fossil Lamellibran- 



chiata 389 



Mr. J. G. Sawkins's Geological Observations on British 



Guiana 389 



On the Transmission of Electricity in Liquids,byDr.D.Macaluso. 389 

 On the Boiling-points of Organic Bodies, by Ludwig Beltzmann. 393 

 Observations on the Colour of Fluorescent Solutions, by Henry 



Morton, Ph.D., President of the Stevens Institute of Teclmology. 393 

 On the Spectra of the Simple Gases, by M. A.-J. Angstrom . . 395 

 On the Testimony of the Spectroscope to the truth of the Nebular 

 Hypothesis, by Professor Daniel Kirkwood, of Bloomington, 



Indiana 399 



On the Solid Crust of the Earth, by Archdeacon Pratt, M.A., 

 F.R.S. 400 



NUMBER CCLXXXIL— DECEMBER. 



Mr. J. A. Phillips on the Connexion of certain Phenomena with 



the Origin of Mineral Veins. (With a Plate.) 401 



Mr. J. St. -Clair Gray on the Origin of Nerve-force 413 



Mr. W. Mathews on Canon Moseley's views upon Glacier- 

 motion 415 



Mr. J. W. L. Glaisher on a Class of Definite Integrals. — Part II. 421 



Mr. R. Pendlebury on some Definite Integrals 437 



Mr. I. Todhunter on a Problem in the Calculus of Variations. . 440 

 The Hon. J. W. Strutt on a Correction sometimes required in 

 Curves professing to represent the Connexion between two 



Physical Magnitudes , 441 



Mr. J. E. H. Gordon on a Method of Measuring the Lateral 

 Diffusion of a Current in a Conductor by means of Equipo- 



tential Lines , . 444 



Mr. F. Guthrie on a Spiral Leyden Jar 447 



Sir W. Thomson on the Equilibrium of Vapour at a Curved Sur- 

 face of Liquid 448 



M. E. Jochmann on the Reflection and Refraction of Light by 



thin Layers of Metal 452 



On Harmonic Ratios in Spectra, by J. L. Soret 464 



On the Electromotive Force of Induction in Liquid Conductors, 

 by Dr. L. Hermann 465 



Index 469 



