THE LONDON, EDINBURGH, AND DUBLIN PHILOSOPHICAL MAGAZINE AND JOURNAL OF SCIENCE. CONDUCTED BY 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. XLII.-FOURTH SERIES. JULY-DECEMBER 1871. J LONDON. TAYLOR AND FRANCIS, RED LION COURT, FLEET STREET, SOLD BY LONGMANS, GREEN, READER, AND DYER; SIMPKIN, MARSHALL AND CO. SMITH AND SON, GLASGOW; HODGES AND SMITH, DUBLIN; AND PUTNAM, NEW YORK, "Meditationis est perscrutari occulta; contemplationis est admirari perspicua . . . . . Admiratio generat quæstionem, quæstio investigationem, investigatio inventionem.”—Hugo de S. Victore. -"Cur spirent venti, cur terra dehiscat, Cur mare turgescat, pelago cur tantus amaror, J. B. Pinelli ad Mazonium. CONTENTS OF VOL. XLII. Page M. L. Schwendler on an Arrangement for the Discharge of long Prof. Challis on the Application of a new Integration of Dif- Messrs. G. J. Stoney and J. E. Reynolds's Inquiry into the Cause of the Interrupted Spectra of Gases.-Part II. On the Absorption-spectrum of Chlorochromic Anhydride .... Mr. S. T. Preston on the Direct Conversion of Dynamic Force Prof. W. A. Norton on the Physical Constitution of the Sun.. Mr. J. C. Douglas on Increasing the Rigidity of long, thin Metallic Pointers, Magnetic Needles, &c.... Notices respecting New Books :— Mr. J. A. S. Rollwyn's Astronomy Simplified for General Reading, with numerous new Explanations and Disco- The Rev. S. J. Perry's Results of Seven Years' Observa- tions of the Dip and Horizontal Force at Stonyhurst College Observatory, from April 1863 to March 1870.. 71 Mr. E. J. Stone on an approximately Decennial Varia- tion of the Temperature at the Observatory at the Cape of Good Hope between the years 1841 and 1870 Prof. A. C. Ramsay on the Physical Relations of the New Red Marl, Rhætic beds, and Lower Lias..... 79 |