The London, Edinburgh and Dublin philosophical magazine and journal of science . o melior quia ex se fila gignunt, nee nostervilior quia ex alienis libamus ut apes. Just. Lips. Polit. lib. i. cap. 1. Not. VOL. XVIII.—FIFTH —DECEMBER 1884. LONDON: TAYLOE AND FRANCIS, RED LION COURT, FLEET STREET. SOLD BY LONGMANS, GREEN, AND CO. ; KENT AND CO. ; SIMPKIN, MARSHALL, AND CO. J AND WIIITTAKER AND CO. ;—AND BY ADAM AND CHARLES BLACK, AND T. AND T. CLARK, EDINBURGH ; SMITH AND SON, GLASGOW J— HODGES, FOSTER, AND CO., DUBLIN; PUTNAM, NEW YORK;—AND ASHER AND BERLIN. Meditationis est per


The London, Edinburgh and Dublin philosophical magazine and journal of science . o melior quia ex se fila gignunt, nee nostervilior quia ex alienis libamus ut apes. Just. Lips. Polit. lib. i. cap. 1. Not. VOL. XVIII.—FIFTH —DECEMBER 1884. LONDON: TAYLOE AND FRANCIS, RED LION COURT, FLEET STREET. SOLD BY LONGMANS, GREEN, AND CO. ; KENT AND CO. ; SIMPKIN, MARSHALL, AND CO. J AND WIIITTAKER AND CO. ;—AND BY ADAM AND CHARLES BLACK, AND T. AND T. CLARK, EDINBURGH ; SMITH AND SON, GLASGOW J— HODGES, FOSTER, AND CO., DUBLIN; PUTNAM, NEW YORK;—AND ASHER AND BERLIN. Meditationis est perscrutari occulta ; contemplationis est admirari perspicua Admiratio generat qusestioneni, quaestio investigationem, investigatio inventionem.—Hugo de S. Victore. —Cur spirent venti, cur terra dehiscat,Cur mare turgescat, pelago cur tantus arnaror,Cur caput obscura Phoebus ferrugine condat,Quid toties diros cogat flagrare cometas,Quid pariat nubes, veniant cur fulmina coelo,Quo micet igne Iris, superos quis conciat orbesTarn vario motu. /. B. Pinelli ad CONTENTS OF VOL. XVIII (FIFTH SEEIES). NDMBEE CX.—JULY 1884. PageProf. T. Carnelley on the Periodic Law, as illustrated bycertain Physical Properties of Inorganic Compounds. (Plate I.) 1 Frederick Guthrie on Salt-Solutions and Attached Water . 22Prof. E. Wiedemann on the Electric Discharge in Gases. (Plate II.) 35 Mr. F. Trouton on Molecular Latent Heat 54 Sir A. Campbell and Mr. W. T. Goolden on a Speed Indi-cator for Ships Propellors. (Plate IV.) 57 Profs. W. E. Ayrton and J. Perry on the Gas-Engine Indi-cator-Diagram. (Plate III.) 59 Notices respecting New Books :— Gustav Glaser-De Cews Magneto-elektrischen und dyna-moelektrischen Maschinen ; and Eduard JapingsElektrische Kraftiibertragung, und ihre Anwendung in der Praxis 77 Elementary Treatise on the Planetary Theory, with a collection of Problems 77 On the Magnetism of Organic Bodies, by S. Wleiigel and S. Henrichsen 78 On the Manner


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