organized by G. Popjak ; edited by J. K. Grant. organized by E.A. Barnard ; edited by J. Kay. organised and edited by E. M. Crook. organized and edited by R. T. Williams. edited by D. J. Bell and J. K. Grant. organised by Professor E. A. Braude ; edited by Dr. J. A. Elvidge. organized and edited by Jack Lewis and M. L. H. Green.