editor. K.S. Quisenberry ; associate editor. L.P. Reitz. editor, E. Pungor, associate editor, I. Buz鈇s. editor, M.H. Brennan ; associate editor, D.D. Millar. edited by D. W. Braben, associate editor R. E. Rand. editor, Jules B. Puschett ; associate editor, Arthur Greenberg.