2 Maoris (7), and now in Marshallese becomesa significant finding in view ofits - occurrence in Mongoloids, Eskimos, and Amerindians (8), to whom Heyerdahl (9) credits the population of Polynesia. The present findings (12) indicate a rather homogenous population of the Marshall Islands with extremes of gene frequencies. With some reservations, because of the relatively small sample, the following facts are of interest in the blood groupings of the Marshallese: (i) the extremely high frequency of the O gene (78.9 per cent); (ii) the extremely low frequency of the M gene (14 percent); (iii) the highest incidence of the R} gene yet reported (98.5. percent); (iv) the presence of 10.8 percent of Duffy The investigations of numerous au- thors, single example of A,B. 0 and summarized by Mourant, relate these blood groupings most nearly to those found in Southeast Asia and Indonesia, where relatively frequent B genes, a high N frequency, and a similarly high frequency of the R? gene are found. Lzon N. Sussman Department of Laboratories. Beth Israel Hospital, New York Leo H. Meyer South Nassau Communities Hospital, Oceanside, New York Rosert A. Conarp Medical Department, Brookhaven National Laboratory, Upton, New York (Fy") negatives; (v) the absence of the Kell and Diego blood factors; (vi) a compiled References and Notes 1. R. A. Conard, L. M. Meyer, W. Wollins, W. W. Sutow, J. 5. Robertson, A. Lowery, H. C. 2. Urshel, J. M. Barton, “Medical survey of Marshallese four years post exposure,” in preparation. W. C. Boyd and R. Shapleigh, J. Lab. Clin. Med. 44, 235 (1954). 3. A, E. Mourant, The Distribution of the Human Blood Groups (Thomas, Springfield, TL, 1954), p. 123; L. N. Sussman, Am. J. Clin. 4. Pathol. 26, 471 (1956). R. T. Simmons, J. J. Graydon, N. M. Semple, Jj. B. Birdsell, J. D. Milbourne, J. R. Lee, Am. J. Physical Anthropol. 10, 31 (1953). 5. We are indebted to Dr. Philip Levine, who supplied the anti-Di* serum, and to Dr. Miguel Layrisse, who supplied the Di*-positive cells for control. 6. R. T. Simmons and J. J. Graydon, Am. J. Physical Anthropol. 15, 357 (1957). 7. H. Lehmann, A. North, J. M. Staveley, Na8 ture 181, 791 (1958). P. Levine, M. Layrisse, E. A. Robinson, T. Arends, R. D. Sisco, ibid. 177, 40 (1956); M. Layrisse and T. Arends, ibid. 177, 1083 (1956) ; M. Lewis, H. Ayukawa, B. Chown, P. Levine, 9. ibid. 177, 1084 (1956). T. Heyerdabl, American Indians in the Pacific: The Theory Behind the Kon-Tiki Expedition (Allen and Unwin, London, 1952), p. 821. 10. We acknowledge the technical assistance of Hannah Pretshold. 5 August 1958