general editor, R. W. F. Hardy ; section editor, A. H. Gibson. general editor, R. W. F. Hardy ; section editor, W. S. Silver. general editor W. B. Pearson, section editor, A. W. Hanson. general editor, J. Trotter, section editor, G. Ferguson. general editor, W. B. Pearson, section editor, J. Iball. general editor W. B. Pearson, section editor, J. Iball. general editor, W. B. Pearson,section editor, J. Trotter. general editor J. Trotter ; section editor G. Ferguson. general editor, P.G. Ciarlet ; guest editor, C. Le Bris. general editor, R. Blanpain ; editor, A. Verbeke.