. The London, Edinburgh and Dublin philosophical magazine and journal of science. LONDON:TAYLOE AND FEANCIS, EED LION COUET, FLEET STREET. SOLD BY LONGMANS, GREEN, READER, AND DYER; KENT AND CO. ; SIMPKIN, MARSHALL AND CO. ; AND WHITTAKER AND CO. ;—AND BY ADAH AND CHARLES BLACK, AND THOMAS CLARK, EDINBURGH J SMITH AND SON, GLASGOW ;— HODGES, FOSTER, AND CO., DUBLIN;—PUTNAM, NEW YORK ;—AND ASHER AND CO., BERLIN. * Mcditationis est perscrutari occulta; contemplationis est admirari perspicua Admiratio generat quaestioneni, quaestio investigationem, investigatio inventioneui.—Hugo de S. Victore. —


. The London, Edinburgh and Dublin philosophical magazine and journal of science. LONDON:TAYLOE AND FEANCIS, EED LION COUET, FLEET STREET. SOLD BY LONGMANS, GREEN, READER, AND DYER; KENT AND CO. ; SIMPKIN, MARSHALL AND CO. ; AND WHITTAKER AND CO. ;—AND BY ADAH AND CHARLES BLACK, AND THOMAS CLARK, EDINBURGH J SMITH AND SON, GLASGOW ;— HODGES, FOSTER, AND CO., DUBLIN;—PUTNAM, NEW YORK ;—AND ASHER AND CO., BERLIN. * Mcditationis est perscrutari occulta; contemplationis est admirari perspicua Admiratio generat quaestioneni, quaestio investigationem, investigatio inventioneui.—Hugo de S. Victore. —Cur spirent venti, cur terra dehiscat,C. mare turgescat, pelago cur tantus amaror,Cur caput obscura Phoebus ferrugine condat,Quid toties diros cogat tlagrare cometas,Quid pariat nubes, veniant cur fulmina coelo,Quo micet igne Iris, superos quis conciat orbesTarn vario motu. J. B. Pinelli ad CONTENTS OF VOL. XL (FIFTH SEEIES). NUMBEE LXV.—JANUAEY 1881. PageMM. Lecher and Pernter on the Absorption of dark Heat-rays by Gases and Vapours. (Plate I.) 1 Messrs. Carnelley and OShea on a Eelation between theMelting-points of the Elements and their Solid Binary Com-pounds and the Heats of Formation of the latter 28 Dr. 0. J. Lodge on Action at a Distance 36 Mr. S. T. Preston on Action at a Distance 38 Mr. H. MColl on Implicational and Equational Logic 40 Messrs. Ayrton and Perry on Prof. Exners Papers on Contact Electricity 43 Dr. J. H. Gladstone on the Specific Eefraction and Dispersion of Isomeric Bodies 54 Messrs. Brauner and Watts on the Specific Volumes of Oxides 60 Dr. Brauner on the Atomic Weight of Beryllium 65 Proceedings of the Geological Society :— Messrs. H. Keeping and E. B. Tawney on the Beds at Headon Hill and Colwell Bay in the Isle of Wight . 72Mr. J. A. Phillips on the Constitution and History of Grits and Sandstones 73 Note on Mr. Brownes Paper On Actionlondonedinburg5111881lond


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