1. For a discussion of residues in man, see U.S. Department of Health, Education and Welfare, Report of the Secretary’s Commission on Pesticides and Their Relation to Environmental Health, Government Printing Office, Washington, D.C. (1969).
2. Risebrough, R. W.: in M. W. Miller and G. G. Berg (eds.), Chemical Fallout, p. 5, Thomas, Springfield, Ill. (1969).
3. Risebrough, R. W., Menzel, D. B., Martin, D. J., and Olcott, H. S.: Nature 216, 589 (1967).
4. Wurster, C. F., Jr. and Wingate, D. B.: Science 159, 979 (1968).
5. Tabor, E. C.: Trans. N.Y. Acad. Sci. 28, 569 (1966).