About the author ALLEN J. BARD is Norman Hackerman-Welch Regents Chair in Chemistry at the University of Texas at Austin, where he has been a faculty member since 1958. Professor Bard is the recipient of more than twenty academic awards, most recently the Luigi Galvani Medal of the Societa Chimica Italiana, 1992; the G. M. Kosolapoff Award of the American Chemical Society, 1992; and the Award for Outstanding Achievement in the Fields of Analytical Chemistry of the Eastern Analytical Symposium, 1990. A frequent lecturer at major universities throughout the United States and Canada, and a member