. The London, Edinburgh and Dublin philosophical magazine and journal of science. ,, * AND WILLIAM FRANCIS, n Nee aranearum sane textus ideo melior quia ex se fila gignunt, nee noste?Tilior quia ex alienis libamus ut apes. Just. Lips. Polit. lib. i. cap. 1. Not. :—feXTH SERIES, . L JANUARY—JUNE 1911. * LONDONtTAYLOR AND FRANCIS, RED LION COURT, FLEET STREET. SOLD BY SIMPKIN, MARSHALL, HAMILTON, KENT, AND CO., LD. SMITH AND SON, GLASGOW:—HODGES, FIGGIS, AND CO., DUBLIN; VEUVE J. BOYYEAU, PAftIS |—AND ASlIER AND CO., Bfl&UK. 390 k n Meditationis est perscrutari occulta; co
. The London, Edinburgh and Dublin philosophical magazine and journal of science. ,, * AND WILLIAM FRANCIS, n Nee aranearum sane textus ideo melior quia ex se fila gignunt, nee noste?Tilior quia ex alienis libamus ut apes. Just. Lips. Polit. lib. i. cap. 1. Not. :—feXTH SERIES, . L JANUARY—JUNE 1911. * LONDONtTAYLOR AND FRANCIS, RED LION COURT, FLEET STREET. SOLD BY SIMPKIN, MARSHALL, HAMILTON, KENT, AND CO., LD. SMITH AND SON, GLASGOW:—HODGES, FIGGIS, AND CO., DUBLIN; VEUVE J. BOYYEAU, PAftIS |—AND ASlIER AND CO., Bfl&UK. 390 k n Meditationis est perscrutari occulta; contemplationis est admirariperspicua .... Admiratio generat qusestionem, quasstio investigationem,inyestigatio inyentionem.—Hugo de S. Victore. Cur spirent yenti, cur terra dehiscat, Cur mare turgescat, pelago cur tantus amaror,Cur caput obscura Phoebus ferrugine condat,Quid toties diros cogat flagrare cometas,Quid pariat nubes, yeniant cur fulruina coelo,Quo rnicet igne Iris, superos quis conciat orbesTan) yario niotu. J. B. Pinelli ad Mazonium. AXERE Y ciss? CONTENTS OF VOL. XXI. (SIXTH SEEIES). NUMBER CXXL— JANUARY 1911. PageDr. James G. Gray and Mr. Alexander D. Eoss on Magnetic Testing 1 Prof. M. S. Smoluchowski: Some Kemarks on Conduction of Heat through Rarefied Gases 11 Mr. S. B. McLaren on Hamiltons Equations and the Parti-tion of Energy between Matter and Radiation 15 Dr. A. S. Eve on the Ionization of the Atmosphere due to Radioactive Matter 26 Mr. Hugh Mitchell on the Ratios which the Amounts of Substances in Radioactive Equilibrium bear to one another. 40Mr. Norman Campbell on a Method of Determining Capacities in Measurements of Ionization = . 42 Dr. A. 0. Rankine on the Relation between Viscosity and Atomic Weight for the Inert Gases ; with its Application to the case of Radium Emanation . 45 Lord Rayleigh on Bessels Functions as applied to the Vibrations of a Circular Membrane 53 Mr. Horace H. Poole on the Rate of Evolution of Heat by Pitch
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