Yaws, or frambesia, is prevalent in all the islands of the Caribbean Sea. However, until a few years ago the island of Cuba seemed to be an exception, and no cases of this disease had been reported to the health authorities. The apparent freedom from this tropical condition may be attributed to the isolation of the sufferers in the mountainous districts and to the security felt by the members of the medical profession that such a disease as yaws was unknown in Cuba. The geographic incidence of the condition in Cuba is the same as in all the countries in which yaws is common; it is a disease of the rural districts, especially of the mountainous regions. In 1932 I1reported for the first time 3 cases of yaws in white children of a well-to-do family from the Province of Oriente, probably infected by a Haitian maid. Soon afterward