Acknowledgment.-The author is grateful to Professor JH Shroyer, his major advisor at Bradley University, and to Drs. CD Evans and JC Cowan, his immediate supervisors at the Korthern Kegional Research Laboratory, for their interest in this work. Thanks are also due to Dr. EH llelvin for the ultraviolet and infrared data and to lIr. CH Van Etten for the microanalyses.