1. Harger, R. N., and Forney, R. B., Progress in Chemical Toxicology, edit. by Stolman, A., 1, (Academic Press, London, 1963).
2. Ward Smith, H., Methods of Forensic Science, edit. by Curry, A. S., 4, (Inter-science Publishers, New York 1965).
3. Curry, A. S., Walker, G. W., and Simpson, G. S., (in the press).