CONTENTS OF VOL. XXIV. 



(FOURTH SERIES.) 



NUMBER CLVIII.— JULY 1862. 



Page 



M. A. J. Angstrom on the Fraunhofer-lines visible in the Solar 

 Spectrum, (With a Plate.) 1 



Mr. H. F. Baxter on Nerve Force. — Relation of Nerve Force to 

 Electric Force. Origin of Nerve Force 11 



Mr. A. Cayley on the Transcendent gd .u=- log tan (4 a- + i ui) . 1 9 



Dr. Atkinson's Chemical Notices from Foreign Journals .... 22 

 Drs. A. Matthiessen and C. Vogt's Reply to Mr. R. Sabine's 

 " Remarks on the Influence of Traces of Foreign Metals on 



the Electric Conducting Power of Mercury " 30 



Mr. J. Cockle on a New Species of Differential Equations. ... 37 

 The Rev. W. Roberts on some Applications of a Theorem rela- 

 ting to Parallel Surfaces 39 



Prof. Bunsen on the Preparation of the Rubidium Compounds. 46 

 Prof. Potter's Observations upon a Paper by M. De la Rive 



" On the Aurorse Boreales " 51 



Notices respecting New Books : — Prof. KirchhofFs Researches 



on the Solar Spectrum 52 



Proceedings of the Royal Institution : — 



Prof. Tyndall on Force 57 



Proceedings of the Royal Society :— 



Mr. J. A. Broun on the Lunar Semidiurnal Variation of 

 the Barometer ; and on the Law of Disturbance and the 

 Range of the Diurnal Variation of Magnetic Declina- 

 tion near the Magnetic Equator 66 



Dr. J. H. Gladstone on the Atmospheric Lines of the Solar 



Spectrum, and on certain Spectra of Gases 70 



Proceedings of the Geological Society : — 



Prof. Harkness on the Position of the Pteraspis -beds .... 73 



Mr. W. Whitaker on the London Basin 74 



Mr. J. Bolton on a Clay-deposit with Insects, Leaves, &c. 



near Ulverston 74 



Prof. Huxley on two new Labyrinthodonts 75 



Dr. Dawson on the Land Flora of the Devonian Period 



in North-eastern America 75 



Prof. Sandberger on some Upper Eocene Fossils. ...... 76 



On the Electromotive Force of Voltaic Piles, by M. Marie Davy. 76 

 Examination of theWindow-glass of Pompeii, by M.G.Bontemps. 78 

 On a Question in the Theory of Probabilities, by Prof. Boole. . 80 



