dry. Cases of secondary infection were all probably results of scratch- ing, and were easily cleared up by antibiotics. Several weeks following the appearance of the lesions, the affected areas became slightly indurated, very deeply pigmented and with some fissuring of the areas but no frank ulceration. About twenty-five to thirty days after exposure the areas presented a superficial slough that resembled the peeling of a second degree simburn. Under the slough the skin was parchment-like in appearance and was depigmented. The foot lesions came last and displayed the most severe symptoms. The lesions developed blebs from the original papules which were filled with a serous fluid. After the blebs had drained, the lesions healed with sloughing and depigmentation, as described above. sions were All of these le- on the dorsum of the feet and between the toes. Weight bearing on the feet was painful and the individuals characteristically walked on their heels. . Epilation of the scalp first appeared on about the thirteenth or fourteenth day and was patchy in distribution. in the same areas as the scalp lesions. more severely in children. Epilation appeared earlier and A few cases developed into practically com- plete epilation of the head. weeks. In most cases it appeared This tendency continued for three to four No regrowth of hair was noticed in the first two months after the exposure. There was no evidence of hair loss except on the head. Statistics based on Rongelap group incidence figures — H plus thir ty days -- were: Epi la tion AFWL/HO e e e . ° e e ° e e 46% / OL.