Received for publication May 7, 1969. The investigation reported in this paper (No. 69-10-162) is in connection with a project of the Kentucky Agricultural Experiment Station and is published with approval of the Director.
Department of Horticulture.
Present address: Department of Horticulture, Iowa State University, Ames.
The authors wish to acknowledge the technical assistance of Miss Z. M. McClure in the analysis of amino acids.