1. Christensen, H. N., and Hastings, A. B., J. Biol Chem., 136, 387 (1940).
2. Folch, J., “Psychiatric Research” 24 (Harvard Univ. Press, Cambridge, Mass., 1948).
3. Baer, E., Buchnea, D., and Newcombe, A. G., Amer. Chem. Soc., 78, 232 (1956).
4. Christensen, H. N., Science, 122, 1087 (1955).
5. Steinbach, H. B., “Nerve Impulse, Transactions of the Second Josiah Macy Conference”, 15 (ed. D. Nachmansohn, Josiah Macy Foundation, New York, 1951).