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TEXT-BOOK OF ELECTROCHEMISTRY THE KINETIC THEORY OF GASES. ElementaryTreatise, withMathematicalAppendices. ByDr. OSKAREMILMEYER,Professor oTfraPnhsylsaitcesd batytRhOeBUEnRiTverEs.itByAYoNfESBr,esMl.aAu..,.SSteucdoenntdoRfevCihrsiesdtECdhiutricohn., Oxford,andDr. Lee'sReaderinPhysics. 8vo,15$.net. THE ARRANGEMENT OF ATOMS IN SPACE. ByJ. H. VANT'HOFF. Second,Revised,and Enlarged Edition. With aPre- theUniversityofZiirich. TranslatedandEditedbyARNOLDEILOART. PRACTICAL ELECTRICAL TESTING IN PHYSICS AND ELECTRICAL ENGINEERING. By G. D. ASPINALL PARR, Assoc.M.I.E.E. With231 Illustrations. 8vo,8s.6d. AN ELEMENTARY TREATISE ON ALTERNATING CURRENTS. ByW.G. RHODES,M.Sc.(Viet.),ConsultingEngineer. 8vo, js.6d.net. A SHORT HISTORY OF THE PROGRESS OF SCIEN- TIFIC CHEMISTRY IN OUR OWN TIMES. ByWILLIAMA. TILDEN,D.Sc. London,F.R.S. Crown8vo,5*.net. INTRODUCTION TO THE STUDY OF CHEMICAL PHILOSOPHY. The Principles of Theoretical and Systematic LCohenmdiosnt,ryF..R.SW.ithFc5apI.ll8uvsot,ra5t*i.onsW.ithByANWSILWLEIRAMSAto.PTrIoLblDeEmNs,.D.FSccp.. 8vo. $s.6ct. HIGHER MATHEMATICS FOR STUDENTS OF CHEM- WEFIexoSlhrTlikobR.wiY,titoBhnAyeNOSJcwD.heonlWsaP.rH,CoYMlSNElILeegCLweOS,R.ZM,eanaDclW.haSiencstd.th,eUrnS.lipavetece8rivasoSli.etnyRie;ofreHroeSncnohcroealartryo aRPnerdasceta1ir8cc5a1hl THE PRINCIPLES OF CHEMISTRY. ByD. MENDELEEFF. Translated from the Russian(Sixth Edition)byGEORGE KAMENSKY, A.R.S.M.,oftheImperialMint,St.Petersburg; andEdited by T.A. LAWSON,B.Sc., Ph.D.,FellowoftheInstituteofChemistry. With96 DiagramsandIllustrations. 2vols. 8vo,36$. OUTLINES OF THEORETICAL CHEMISTRY. By LOTHAR MEYER,ProfessorofChemistryintheUniversityofTubingen. Trans- lated by Professors P. PHILLIPS BEDSON, D.Sc., and W. CARLETON WILLIAMS, B.Sc. 8vo,9$. A DICTIONARY OF APPLIED CHEMISTRY. By T. E. THORPE, C.B., B.Sc. (Viet.), Ph.D.,F.R.S.,PrincipaloftheGovern- mentLaboratory,London. AssistedbyEminentContributors. 3vols. 8vo. Vols.I.andII.,4zs.each. Vol.III.,63s. WATTS' DICTIONARY OF CHEMISTRY. Revised and entirelyRewritten by H. FORSTER MORLEY,M.A.,D.Sc.,Fellowof, and lately Assistant Professor of Chemistry in. University College, LProanedloecnto;ranindCMh.emiMs.trPyA,TToIfSGOoNnviMlUlIeR,anMd.AC.a,iusF.CRo.lSl-eEg.e,, FCealmlborwi,dagen.d AssistedbyEminentContributors. 4vols. 8vo,,5net. SELECT METHODS IN CHEMICAL ANALYSIS, chiefly Inorganic. By Sir WILLIAM CROOKES, F.R.S., etc. ThirdEdition, RewrittenandEnlarged. With67Woodcuts. 8vo,2is.net.. LONGMANS, GREEN, AND CO. LONDON, NEW YORK, AND BOMBAY RT741V* ^ TEXT-BOOK OF ELECTROCHEMISTRY BY SVANTE ARRHENIUS PROFESSOR AT THE UNIVERSITY OF STOCKHOLM TRANSLATED BY JOHN McCRAE, PH.D. WITH NUMEROUS DIAGRAMS LONGMANS, GREEN, AND CO. PATERNOSTER ROW, LONDON 39 NEW YORK AND BOMBAY 1902 Allrights reserved PREFACE THE basis of this book is a series of lectures delivered by me at the University of Stockholm in the autumn of 1897. The English translation has been made from the German edition. In the German translation, made by Dr. H. Euler, many improvements and additions to the original Swedish edition were introduced with reference to the literature up till 1901. Only few alterations have been made in the present edition, and these refer mainly to typographical errors. By the list of literature-references collected by Dr. McCrae considerable value has been added to the book. THE AUTHOR STOCKHOLM, June, 1902.