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Paul L. Kirk, Professor of Criminalistics, School of Criminology, University of California, Berkeley, is a regular contributor to this Journal and has served as one of our Associate Editors for a number of years. His papers reporting on research in the identification of physical evidence have dealt with a variety of subjects; while one series has explored other possible applications of comparative density determinations. Charlotte Brown is a graduate student in the School of Criminology, University of California, and for the last two years has served as Professor Kirk's personal assistant.-EDITOR.

An Improved Density Gradient Technique and Its Application to Paper and Cloth Ash