1. Pontefract, R. D., and Miller, J. J., Canad. J. Microbiology, 8, 573 (1962).
2. Winge, Ö., C.R. Trav. Lab. Carlsberg, Sér. physiol., 21, 77 (1935).
3. Lindegren, C. C., The Yeast Cell, Its Genetics and Cytology (Educational Publishers, Inc., St. Louis, Miss., 1949).
4. Miller, J. J., Wallerstein Lab. Comm., 22 (79) 267 (1959).
5. Wickerham, L., U.S. Dept. Agric. Tech. Bull. No. 1029 (1951).