Notes
This article is based on a dissertation completed under the direction of Theodore L. Harris at the University of Wisconsin, June, 1966. The research and development reported herein was performed pursuant to a contract with the U. S. Office of Education, Dept. of Health, Education, and Welfare, under the provisions of the Cooperative Research Program, Center No. C‐03, Contract OE 5–10–154, Bureau No. 5–0216.