editors, P.L. McCarty and P.V. Roberts. editors, D.H. Sharp and T.F. West. editors, A.D. Roberts and J.E. Mottershead. editors, R.J. Kohel and C.F. Lewis. editors, H.W. Lam and M.J. Thompson. editors, B.R. Appleton and G.K. Celler. editors, D.F. Mettrick and S.S. Desser. editors, G. Giraldo and E. Beth. editors, J.E. Strutt and J.R. Nicholls. editors, M.F. Greaves and L.C. Chan.