electric constant solvent mixtures indicate that the screening coefficieet problem can become mute. Acknowledgment.-The authors mould like to acknewledge the support of the National Science Foundation lG 9974) and the Rackham $chool of Graduate Studies in this research. They express their appreciation of the aid given them by Ronald Keyes in the computer work and C. J. Hallada in the experimental work. Appendix ''Relative" High-Field Conductance Define the "relative" high-field conductance change by
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