CONTENTS OF VOL. XXII. FOURTH SERIES. Vll 



Page 



On Terrestrial Refraction, by M. Babinet 406 



On the Maximum Density of Sea- water, by M. v, Neumann . . 408 



NUMBER CXLIX— DECEMBER. 



The Astronomer Royal on a Projection by Balance of Errors for 



Maps applying to a very large extent of the Earth's Surface ; • 



and Comparison of this projection with other projections . . 409 

 Mr. W. S. Jevons on the Deficiency of Rain in an elevated 



Rain-gauge, as caused by Wind. (With a Plate.) 421 



Mr. A. Cayley on the Cubic Centres of a Line with respect to 



Three Lines and a Line. — Second Note 433 



The Rev. Dr. Lloyd on Earth- currents, and their Connexion with 



the Phenomena of Terrestrial Magnetism 437 



M. W. Haidinger on the Original Formation of Aerolites. — 



Part II 442 



Dr. Boase's Sketch of M. Faye's *' Examen d'un Memoire de 



M. Plana sur la force repulsive et le milieu resistant," with a 



few Remarks thereon 458 



Prof. Tyndall on Lunar Radiation 470 



Prof. Frankland on the Blue Band of the Lithium Spectrum . . 472 

 Proceedings of the Royal Society:— 



Dr. Hofmann on the Arsenic-Bases .*. 473 



Dr. Hofmann on the Separation of the Ethyle-Bases .... 477 

 Major- General Sabine on the Lunar-diurnal Variation of 



the Magnetic Declination 479 



Mr. Gr. Gore on the Properties of Liquid Carbonic Acid. . 485 



On Lunar Radiation, by D. D. Heath, Esq 486 



On the Dihexahedral Crystals of Sulphate of Potash, by Karl 



Ritter von Hauer 486 



Comparison of the Temperature in the Air and of the Soil at a 



depth of two metres, by M. Pouriau 488 



NUMBER CL.— SUPPLEMENT TO VOL. XXII. 



Mr. D. Vaughan on Static and Dynamic Stability in the Se- 

 condary Systems 489 



Professors Kirchhoff and Bunsen on Chemical Analysis by Spec- 

 trum-observations. (With a Chromolithograph.) 498 



Mr. W. S. B. Woolhouse on the Rev. T. P. Kirkman's Problem 

 respecting certain Triadic Arrangements of Fifteen Symbols. 510 



Dr. Atkinson's Chemical Notices from Foreign Journals .... 515 



Prof. Magnus on the Changes in the Induced Current by the 

 employment of different Resistances 522 



Prof. Zenger on the Measurement of the Intensity of Electric 

 Currents by means of a Tangent-galvanometer or a Multiplier. 529 



The Astronomer Royal on the Circularity of the Sun's Disc . . 532 



