1. U.S., Food and Drug Administration, data on pesticide residues in fish, Exhibit 13, Table 1, 194, in Hearings before the Subcommittee on Reorganization and International Organizations of the Committee on Government Operations (U.S. Senate, Eighty-eighth Congress, first session, Part 1, 1963).
2. President's Science Advisory Committee, Use of Pesticides (The White House, Washington, D.C., 1963).
3. Sladen, W. J. L., Nature, 171, 952 (1953); Sladen, W. J. L., Falkland Islands Dependencies Surv., Sci. Rep., No. 17 (H.M.S.O., London, 1958).
4. Penney, R. L. (unpublished results).
5. Wilson, E. A., Bowers, H. R., and Cherry-Garrard, A., in Scott's Last Expedition, 2, 1 (London, 1914).