; as Wee ty ate te a a Tel hee Do tl a Dele keTa ee tee > ow eat cag often! SeoUGLY iea eee healing. Histologic study of biopsies of lesions showed changes consistent with radiation injury. These changes were much more pronounced in the epidermis than in the dermis. A few histologic changes were still in evidence at the site of deeper lesions six months after the accident. With only a few exceptions the lesions did not become secondarily infected nor were they associated with systemic effects. They healed rapidly, usually with nmspecific treatment. Epilation was spotty and occurred mainly in the Children. Regrowth of normal hair occurred beginning about the third month and was complete by the sixth month. Discoloration of the nails in the semlunar area occurred in the majority of people in the higher exposure groups. It was first noticed about the third week after exposure and had completely grown out with the nails in most cases by six months. ACKNOWLEDGMENT The authors wish to express their sincere appreciation to Dr. E. P. Cronkite of Brook- haven National Laboratory, who was in charge of this mission, and other members of the team for their invaluable cooperation and assistance. We are also deeply grateful to Billiet Edmond, Marshallese school teacher of the Rongelap people, for his great help in interpreting, and also to Miss Pat Roan of NRDL fa histological preparation of tissues; to William Murray and George Needham of NRDL and C. P. A. Strome, HMC, USN of NMBI for assistance in photography; to C. R. Sipe, HMC, USN of NMRI for assistance in preparation of this report; and to Cdr. A. B. Williams, MC, USN of NMRI for helpful suggestions in editing the manuscript. 439