. The London, Edinburgh and Dublin philosophical magazine and journal of science . ** •••47 ^\ LONDON: TAYLOR AND FRANCIS, RED LION COURT. FLEET STREET. SOLD BY LONGMANS, GREEX, READER, AND DYER ; KENT AND CO. J SIMPKIN, MARSHALL AND CO. ; AND WHITTAKER AND CO.;—AND BY ADAM AND CHARLES BLACK. AND THOMAS CLARK. EDINBURGH J SMITH AND SON, GLASGOW; — HODGES, FOSTER. AND DUBLIN J PUTNAM. NEW YORK;—AND ASHER AND CO., BERLIN. u Meditationis est perscrutari occulta; contemplationis est admirari perspicua Adiniratio generat quaestionem, queestio investigationem, investigatio inventionem.—Hugo de
. The London, Edinburgh and Dublin philosophical magazine and journal of science . ** •••47 ^\ LONDON: TAYLOR AND FRANCIS, RED LION COURT. FLEET STREET. SOLD BY LONGMANS, GREEX, READER, AND DYER ; KENT AND CO. J SIMPKIN, MARSHALL AND CO. ; AND WHITTAKER AND CO.;—AND BY ADAM AND CHARLES BLACK. AND THOMAS CLARK. EDINBURGH J SMITH AND SON, GLASGOW; — HODGES, FOSTER. AND DUBLIN J PUTNAM. NEW YORK;—AND ASHER AND CO., BERLIN. u Meditationis est perscrutari occulta; contemplationis est admirari perspicua Adiniratio generat quaestionem, queestio investigationem, investigatio inventionem.—Hugo de S. Victore. —Cur spirent venti, cur terra dehiscatCur rnare turgescat, pelago cur tantus amaror,Cur caput obscura Phoebus ferrugme condat,Quid toties diros cogat flagrare cometasQuid pariat nubes, veniant cur fulmina coelo,Quo micet igne Iris, superos quis conciat orbesTarn vario motu. J. B. Pinelli ad Mazonium. FLAMMAM,. CONTENTS OF VOL, VIIL (FIFTH SEEIES). NUMBEE XLYI.—JULY 1879. PageDr. F. Auerbach on the Passage of the Galvanic Current through Iron. (Plate I.) 1 Prof. S. P. Thompson and Dr. 0. J. Lodge on Unilateral Con-ductivity in Tourmaline Crystals 18 Mr. F. Guthrie on the Fracture of Colloids. (Plates II. & III.) 25Professors J. Perry and W. E. Ayrton on a neglected Principle that may be employed in Earthquake Measurements. (Plate IV.) 30 Prof. D. E. Hughes on an Induction-balance and Experimental Eesearches therewith. (Plate V.) 50 Mr. W. C. Roberts on the Examination of certain Alloys by the Aid of the Induction-balance. (Plate VI.) 57 Mr. 0. Heaviside on the Theory of Faults in Cables 60 Mr. 1ST. D. C. Hodges on the Size of Molecules 74 Dr. J. W. Draper on a new Form of Spectrometer, and on the Distribution of the Intensity of Light in the 75 On the Electric Light, by M. J. Jamin 81 On the Deviations of Amperes Theory of Magnetism from the Theory of the Electromagnetic F
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