following estimates; because it is more complete and it provides a selfconsistent set of data. However, in view of the discrepancies, the results can only be considered as approximations. This probably makes little real difference in view of the uncertainties in the risk coefficients that were _. used. There is also a bias built into the data because of the inclusion of Ebye and Majaro in the overall Marshall Istand rates. This arises from the different death rates (particularly infants) at these two locations. [In many respects the population of Ebye and Majaro are quite dissimilar from the Bikini population because they have the advantages and disadvantages of a more technical environment. For the estimates the last 5 or 6 year average of the data were used because they are probably the most representative of current conditions. From this, the following were obtained: 1. 2. Rate of increase of the population has been about 3.8%/year. Infant death rate is about 3.2% per birth. 3. Overall. death rate is 0.54% per year. 4. Birth rate is 4.2% per year. A population of 550 was assumed for the one that might move back to Bikini Atoll. Values for other initial populations were obtained by ratios of the results. The total population at the end of 30 years is given by the compounding equation: Pay = 550 (1 + 0.038 39 = 1684