1. Moore, N. W., and Tatton, J. O'G., Nature, 207, 42 (1965).
2. Moore, N. W., in Ecology and the Industrial Society, British Ecological Society Symposium, 219 (Blackwell, Oxford, 1965).
3. de Faubert Maunder, M. J., Egan, H., Godly, E. W., Hammond, E. W., Roburn, J., and Thomson, J., Analyst, 89, 157 (1964).
4. Bowman, M. C., and Beroza, M., J. Assoc. Off. Agric. Chem., 48, 943 (1965).
5. Young, I. G., Gas Chromatography (edit. by Noebels, H. J. ) (Academic Press, New York, 1961).