1. Jacobs, M. H., Modern Trends in Physiology and Biochemistry (Academic Press, Inc., New York, 1952).
2. Villegas, R., and Villegas, G. M., J. Gen. Physiol., 43, 73 (1960).
3. Goldstein, D. A., and Solomon, A. K., J. Gen. Physiol., 44, 1 (1960).
4. Bennet, H. Stanley, in The Structure and Function of Muscles edit. by Bourne, G. H., 137 (Academic Press, New York, 1960).
5. Brandt, P. W., Reuben, J. P., López, E., Girardier, L., and Grundfest, H., Anat. Rec., 145, 210 (1963).