SIR ROBERT KANE, LL.D. F.R.S. M.R.I.A. F.C.S. AND WILLIAM FRANCIS, PH.D. F.L.S. F.R.A.S. F.C.S. "Nec aranearum sane textus ideo melior quia ex se fila gignunt, nec noster VOL. XLVIII.-FOURTH SERIES. LONDON. TAYLOR AND FRANCIS, RED LION COURT, FLEET STREET, L SOLD BY LONGMANS, GREEN, READER, AND DYER; KENT AND CO.; SIMPKIN, MARSHALL, YORK AND ASHER AND CO., BERLIN. Meditationis est perscrutari occulta; contemplationis est admirari perspicua..... Admiratio generat quæstionem, quæstio investigationem, investigatio inventionem."-Hugo de S. Victore. 4 Prof. R. Clausius on different Forms of the Virial. Mr. F. P. Purvis on Amsler's Planimeter Prof. A. W. Wright on the Polarization of the Zodiacal Light. Baron N. Schilling on the Constant Currents in the Air and in the Sea: an Attempt to refer them to a common Cause.. Mr. R. Mallet on the Tidal Retardation of the Earth's Rotation. Mr. J. W. L. Glaisher on a New Formula in Definite Integrals. 53 Dr. J. Rae on some Physical Properties of Ice; on the Trans- Prof. R. Owen on the Skull of a dentigerous Bird.. Mr. J. W. Hulke on the Anatomy of Hypsilophodon Foxii. On Constant Electric Currents, by M. Heine, of Halle 79 |