1. Arnold, J. R., and Libby, W. F., Science, 110, 678 (1949).
2. The B.P. (before present) dates are calculated from the year 1959.
3. Satterthwaite, L., and Ralph, E. K., Amer. Antiquity, 26 (in the press).
4. Godwin, H., Nature, 184, 1365 (1959).
5. Vries, Hl. de, Proc. Kon. Ned. Akad. van Wetenschappen, B, 61 (2), 1 (1958).