K. LAL GAURI, PhD, a Professor Emeritus at the University of Louisville, obtained a PhD in geology at the University of Bonn, Germany. After postdoctoral research at California Institute of Technology, he joined the University of Louisville in 1966, retiring in 1998. A permanent member of the committee of the International Congress on Deterioration and Preservation of Stone Objects, Dr. Gauri was president of its Fourth Congress, held in Louisville in 1982. He was the president of Sigma-Xi's Louisville chapter in 1974 and 1994. JAYANTA K. BANDYOPADHYAY, PhD, received his PhD in chemical engine...