Three deaths have occurred in the exposed people. The first was in a 46 year old man who died of hypertensive heart disease 1 year post=- exposure. He had had the disease at the time of irradiation. death occurred in a 78 year old man at 2 years post-expoaure. The second He was a diabetic of long stending and died apparently of coronary heart disease. A third death occurred in April, 1958 in a 38 year old man. the group which received 69 r.) a severe case of chicken pox. (He was in Death was due to pneumonia complicating In none of these casea was there any evidence that death was due to irradiation exposure. 2. Growth and development studies. Cross-sectioned data on height and weight and bone age determinations for the 2 and 3 year surveys gave an impression of leg in growth and development in the exposed children com pared with unexposed children, However, in an attempt to obtain more ac- curate birth dates of the children on the 4 year survey, it was found that ages of some of the children which were thought to be established were in question. The absence of recorded birth information seriously complicates the determination of the accuracy of given chronological ages and dates of birth. More definitive evaluation of the data will be possible when veri- fication of the birth dates is completed. Detailed geneclogical and bio- logicai histories are being compiled to establish the most probable birth dates of each of the children. (Unfortunately the 1958 roentgengrams of the wrist and knee, intended for assessment of osseous maturation, were lost at sea.) In addition to cross-sectioned studies, longitudinal studies of incremental growth data and bone maturation studies over the period since ~Ba