SAVO BRATOS, Laboratoire de Physique The´orique des Liquides Universite´ Pierre et Marie Curie, 75252 Paris Cedex, France MARK S. CHILD, Physical and Theoretical Chemistry Laboratory, Oxford University, Oxford, 0X1 3QZ, United KingdomEVELYN M. GOLDFIELD, Department of Chemistry, Wayne State University of Michigan, 48202 USASTEPHEN K. GRAY, Chemistry Division, Argonne National Laboratory, Illinois 60439 USAVASSILIY LUBCHENKO, Department of Chemistry, University of Houston, Houston, Texas 77204-5003 USAG. ALI MANSOORI, Departments of Biology and Chemical Engineering, University of Illinois at Chicago, Chicago, Illinois 60612 USAPETER G. WOLYNES, Department of Chemistry and Biochemistry and Department of Physics, University of California at San Diego, La Jolla, California 92093-0371 USAMICHAEL WULFF, European Synchrotron Radiation Facility, 38043 Grenoble Cedex, France