edited by A. Singer and E. Galan. edited by Albert S. Kaplan. edited by M. Granger Morgan. edited by A. G. Walton. edited by A. L. H. Gameson. edited by A. T. Balaban. edited by A. T. S. Ramsay. edited by A.E. Green. edited by A.F.J. van Raan. edited by Alan H. Goldman.