individual can make an enormous difference in science. The effect of his life and work on those of us who contributed papers for this issue and on many others is appreciated and is acknowledged by several of the authors in their individual papers. It is entirely appropriate to honor his memory with this special issue. Department of Chemistry, R. M. IZATT Brigham Young University, Provo, UT 84602, U.S.A. J. S. BRADSHAW 3 (a) Charles Pedersen on campus at the University of Dayton in the mid-1920's. 4 FOREWORD / f (b) Charles Pedersen in his laboratory at the Experimental Station in 1968. 5...