Twice, in 1956 and 1957, I stayed for three weeks on the Navaho reservation in order to treat and observe skin diseases among The People (Dine), as the Navahos call themselves. This was considered a project of the University of Cincinnati in preparation for a systematic investigation, which will be conducted when funds become available. So far, I have gone on my own, with clearance from the health authorities. The reservation is situated mostly in northeastern Arizona and extends into New Mexico and Utah, altogether 25,000 square miles, the size of West Virginia. Three-fourths of the "Four Corners" is Navaho land. The country is characterized by high altitude, dry air, arid soil, and intense sunlight. Within these over-all characteristics there is variation according to seasons, altitudes, and nearness of water sources, but in general this big land, at the present time, is too poor to provide a