From February to March of 1956 a mass medical examination was conducted on the A-bomb exposed. Comparing the A-bomb survivors groups with the control groups, and also comparing with the results of the examination in 1953 we reached the following conclusions: 1) In comparison with the year of 1953 the exposed groups showed a marked restoration of anemia and a marked decrease of eosinophilia in 1956. 2) In 1956, WBC count, Hb. lebel, eosinophilia above 5%, percentage of monocyte and lymphocyte showed no significant variation between the exposed and control groups. Only for eosinophilia above 10% the exposed groups showed a more significant high rate than the control groups. 3) Accordingly, so tar as concerned with the peripheral blood, it may be duly said that hematopoietic dysfunction returned to an almost normal condition in 1956, eleven years after exposure
