QUARTERLY REVIEWS THE CHEMICAL SOCIETY PATRON HER MAJESTY THE QUEEN President E. L. HIRST M.A. D.Sc. LL.D. F.R.S. Vice-Presidents who have filled the office of President SIR IAN HEILBRON D.S.O. D.Sc. W. H. MILLS M.A. Sc.D. F.R.S. SIR CYRIL HINSHELWOOD M.A. D.Sc. F.R.S. C.K. INGOLD,D.SC. F.R.I.C. F.R.S. F.R.I.C. LL.D. F.R.S. SIR ERIC RIDEAL M.B.E. M A . Sc.D. F.R.S. W. WARDLAW C.B.E. ([D.Sc. Vice-presidents WILSON BAKER M.A. D.Sc. F.R.S. M. STACEY Ph.D. D.Sc. F.R.S. R.D. HAWORTR D.Sc.,Ph.D.,F.R.S. L. E. SUTTON M.A. D.Phil. F.R.S. E. D. HUGHES D.Sc. F.R.I.C. SIR ALEXAXV~ER ToDD;%M;A. D.Sc. F.R.S. F.R.S. Honorary Treasurer M. W. PERRIN C.B.E. M.A. F.R.I.C. Honorary Secretaries F. BERGEL D.PhiI.Nat. D.Sc. J. CHATT M.A. Sc.D. F.R.I.C. F.R.I.C. M. J. S. DEWAR M.A. D.Phi1. Ordinary Members of Council D.W. ADAMSON M.Sc. D.Phil. R. G. R. BACON Ph.D. A.R.C.S. G. R. BARKER B.Sc. Ph.D. R. M. BARRER D.Sc. Sc.D. F.R.S. F. BELL D.Sc. F.R.I.C. F.R.S.E. A. J. BIRCH M.Sc. D.Phi1. V. M. CLARK M.A. Ph.D. A. G. EVANS Ph.D. D.Sc. F.R.I.C. A. HICKLING D.Sc. Ph.D. F.R.I.C. L. HUNTER Ph.D. D.Sc. F.R.I.C. A. W. JOHNSON M.A. Ph.D. J. D. LOUDON Ph.D. D.Sc. B. LYTHGOE M.A. Ph.D. F.R.I.C. A. MACCOLL M.Sc. Ph.D. R. S. NYHOLM M.Sc. D.Sc. F.R.I.C. F. H. POLLARD B.Sc. Ph.D. R. E. RICHARDS M.A. D.Phi1. L. A. K. STAVELEY M.A. J. C. TATLOW Ph.D. D.Sc. F.R.I.C. W. WILD B.Sc. Ph.D. A.R.I.C. A.R.I.C. A.R.C.S. G. T. YOUNG Ph.D. M.A. A.R.I.C. Generd Secretary J. R. RUCK KEENE M.B.E. T.D. M.A. Librarian Deputy Librarian R. G. GRIBFIN F.L.A. J. BIRD Telephone Numbers Regent 0675-6. Printed in Great Britain by Butler & Tanner Ltd.Frome and London QUARTERLY REVIEWS Publication Committee Chairman C. K. INGIOLD D.Sc. F.R.I.C. F.R.S. C. C. ADDISON,D.SC.,P~.D.,F.R.I.C. F. BERGEL D.Phil.Nat. D.Sc. E. BOYLAND D.Sc. Ph.D. N. CAMPBELL D.Sc. Ph.D. N. B. CHAPMAN M.A. Ph.D. J. CHATT M.A. Sc.D. F.R.I.C. P. B. D. DE LA MARE D.Sc. Ph.D. M. J. S. DEWAR M.A. D.Phi1. D. D. ELEY Sc.D. Ph.D. H. J. EMELEUS D.Sc. A.R.C.S. D. H. EVERETT M.B.E. M.A. D.Phi1. G. GEE Sc.D. A.R.I.C. F.R.S. T. G. HALSALL Ph.D. M.A. A.R.I.C. B. A. HEMS D.Sc. F.R.I.C. D. H. HEY D.Sc. F.R.I.C. F.R.S. E. L. HIRST C.B.E. D:Sc. LL.D. H. R. ING M.A. D.Phil. F.R.S. D. J. G. IVES D.Sc. A.R.C.S. F.R.I.C. F.R.S. F.R.S. F.R.I.C. E. R. H. JONES D.Sc. F.R.I.C. G. W. KENNER M.Sc. Ph.D. H. C. LONGUET-HIGGINS M.A.B. LYTHGOE M.A. Ph.D. F.R.I.C. R. A. MORTON D.Sc. Ph.D. F.R.S. A. NEUBERGER Ph.D. M.D. F.R.S. R. G. W. NORRISH Sc.D. F.R.I.C. H. T. OPENSHAW M.A. D.Phi1. M. W.PERRIN,C.B.E.,M.A.,F.R.I.C. V. PETROW Ph.D. D.Sc. F.R.I.C. H. M. POWELL M.A. B.Sc. F.R.S. P. L. ROBINSON D.Sc. F.R.I.C. K. SCHOFIELD Ph.D. D.Sc. F.R.I.C. J. C. SPEAKMAN M.Sc. Ph.D. D.Sc. H. W. THOMPSON,M.A. D.Sc. F.R.S. E. E. TURNER M.A. D.Sc. F.R.S. A. R. J. P. UBBELOHDE M.A. D.Sc. F.R.S. D.Phi1. F.R.S. F.R.S. Editor R. 5. CAEN M.A. D.Phil.Nat. F.R.I.C. Assistant Editors A. E. SOMERFIELD Ph.D. A. D. MITCHELL D.So. F.R.I.C. L. C. CROSS Ph.D. A.R.C.S. F.R.I.C. LONDON T H E CHEMIOAL S O C I E T Y CONTENTS PAGE QUANTITATIVE STUDY OF STERIC HINDRANCE. By C. K. Ingold 1 MESO-IONIC COIMPOUNDS. By Wilson Baker and W. D. Ollis 15 THE CHEMISTRY OF POLONIUM.By K. W. Bagnall . . 30 SOME GENERAL ASPECTS OF THE INORGANIC CHEMISTRY OF CARBOHYDRATE PHOSPHATES. By A. B. Foster and W. G. ENERGY TRANSFER IN GASEOUS COLLISIONS. FLVORINE. By A. G. Sharpe . . 49 Overend . . 61 and W. D. McGrath . . 87 HALOGEN COMPOUNDS. By I. T. Millar and H. Heaney . 109 By 5. C. McCoubrey GRIGNARD AND ORGANOLITHIUM REAGENTS DERIVED FROM DI- THE STRUCTURES OF ELECTRON-DEFICIENT MOLECULES. By ULTRASONIC ANALYSIS OF MOLECULAR RELAXATION PROCESSES NUCLEAR QUADRUPOLE @UPLING AND CHEMICAL BON~ING. By RECENT ADVANCES IN SESQUITERPENOID CHXMISTRY. By D. H. H. C. Longuet-Higgins . . 122 IN LIQTJIDS. By R. 0. Davies and J. Lamb . 134 W. J. Orville-Thomas . 162 R. Barton and P. de Mayo . 189 SEMICONDUCTIVITY AND CATALYSIS. By Peter J. Fensham . 227 THERMAL TRANSFORMATIONS IN SOLIDS. By A. R. Ubbelohde 246 THE MOLECULAR-ORBITAL AND EQUIVALENT-ORBITAL APPROACH TO MOLECULAR STRUCTURE. By J. A. Pople . . 273 ELECTRON CORRELATION AND CHEMICAL CONSEQUENCES. By P. G. Dickens and 5. W. Linnett . . 291 ELEMENTARY REACTIONS IN GAS-PHASE SLOW COMBUSTION. By C. F. H. Tipper . . 313 INORGANIC STEREOCHEMISTRY. By R. J. Gillespie and R. S . Nyholm . . 339 LIGAND-FIELD THEORY. By J. S. Griffith and L. E. Orgel . 381 CUMULATIVE INDEXES Vols. I-XI . 395 THE INOSITOLS. By S. J. Angyal . . 212