illnesses or degenerative diseases than seen in the unexposed populations examined. During the 14 years since exposure fifteen deaths among the 82 exposed people of Rongelap have occurred. This death rate was somewhat greater in the exposed people but in no case was there definite relation of cause of death with radiation exposure. a greater number It should be mentioned that there have been of older people in the exposed group. No leukemia has been seen. The occurence of three cases of cancer in the exposed group(one of the thyroid gland) presents a higher incidence in this exposed group but due to the small numbers of people involved, final decision on this point must await the results of future observations. Based on birth rates, fertility has been about equal in the exposed group as compared with the unexposed population. However about twice the number of miscarriages and stillbirths occurred in the exposed women during the first four years after exposure. Fetal abnormalities do not appear to have been more numerous in the exposed group. No specific genetic studies have been carried out. A low level of persisting chromosomal aberrations, of the type induced by radiation, have been noted as late as ten years postexposure in the Rongelap people. Frequent slit-lamp observations have revealed no opacities of the lens characteristic of radiation exposure. Evidence for premature aging or shortened life span in the =xposed population compared with the unexposed population have not been apparent as a result of studies quantifying a number of recognized aging parameters. 5001292