. The London, Edinburgh and Dublin philosophical magazine and journal of science. I OX BOX:TAYLOR AND FRANCIS, RED LION COURT, FLEET STREET. SOLI) BY LONGMANS, GREEN, READER, AND DYER J KENT AND CO. ; SIMPKIN, MARSHALL AND CO. ; AND WIIITTAKER 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, 11 Meditationis est perscrutari occulta; contemplationis est adniiran perspicua Adrniratio generat qusestioneni, queestio investigationem, investigatio inventionem.—Hugo de S. V


. The London, Edinburgh and Dublin philosophical magazine and journal of science. I OX BOX:TAYLOR AND FRANCIS, RED LION COURT, FLEET STREET. SOLI) BY LONGMANS, GREEN, READER, AND DYER J KENT AND CO. ; SIMPKIN, MARSHALL AND CO. ; AND WIIITTAKER 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, 11 Meditationis est perscrutari occulta; contemplationis est adniiran perspicua Adrniratio generat qusestioneni, queestio investigationem, investigatio inventionem.—Hugo de S. Victore. — Cur spirent venti, cur terra dehiscat,Our mare turgescat, pelago,cur tantus arnaror,Cur caput obscura Phcefotfs ferrugine condat,Quid toties diros cogat flagrare cometas;Quid pariat nubes, veuiaut cur fulmina ccelo,Quo micet igne Iris, superos quis conciat orbesTam vario motu. J. B. Pinelli ad Mazonium. JlLEHK I CONTENTS OF VOL. VI. (FIFTH SEEIES), NUMBER XXX1Y.—JULY 1878. Page Dr. J. Croll on the Origin of Nebulae 1 Mr. T. Bayley on the Analysis of Alloys containing Copper, Zinc, and Nickel 14 Dr. W. Ramsay on Picoline and its Derivatives 19 Frederick Guthrie on Salt Solutions and Attached Water . 35Prof. Hughes on the Physical Action of the Microphone .... 44Mr. R. Meldola on a Cause for the Appearance of Bright Lines in the Solar Spectrum 50 Dr. E. J. Millss Researches in Thermometry 62 Mr. R. H. M. Bosanquet on the Relation between the Notes of Open and Stopped Pipes 63 Notices respecting New Books :— The Rev. R. M. Ferrerss Elementary Treatise on Sphe-rical Harmonics and Subjects connected with them . 66Mr. H. F. Blanfords First and Second Parts of the IndianMeteorologists Yade Mecum; and Tables for the Re-duction of Meteorological Observations in India .... 67Proceedings of the Geological Society :— Mr. W. A. E. LTssher on the Chronological Value of the Triassic Strata of the


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