whether or not the length of a survivor's life will be shortened by exposure. There are 100,000 people in the group studied in both Hiroshima and Nagasaki. (2) An adult health study composed of a group of 20,000 people of the 100,000 in the life-span group. The purpose here is to study what effects irradiation may have on the exposed persons, such as certain kinds of cancer, cataracts of the eye, or growth retardation. About 10,000 persons are examined annually and thus it requires two years to complete the survey of the whole group. (3) A pathology study involving the examination of those survivors who die. This is done in order to find out if there are effects of the radiation which cannot be found in the ordinary annual examinations. The ABCC's major finding up to 1972 were increased leukemia and thyroid cancer. It was also stated that cancer in general seemed to be increased, including that of the salivary gland, lung, and breast. This was apparently developing in children who were 10 years old at the time of the bomb and who received 100 rads or more. The incidence of leukemia peaked in 1952, but is still not normal and the incidence of thyroid cancer has not yet peaked. It was also explained that children born after the bomb have so far not shown any increase in cancer or early death. Additional comments by the ABCC doctors indicated that they were still finding new things. [O14b54 The children who were less than 10 years 53