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This extensive volume contains separate studies on the politics, government, education, labor, migration, and culture of Puerto Rico. It also includes reports on the contemporary Federal-regional relationship in Puerto Rico and on Puerto Rico's relationship with the United States. One study deals with the Dutch, French, and British areas of the Caribbean. There is also an inventory which lists (1) the agencies of the United States Government with offices in Puerto Rico and (2) the departments of the Executive Branch of the Commonwealth of Puerto Rico. (LB)

To study the prevalence of mental retardation in Puerto Rico, the proportional distribution of successful retardates, and the processes accounting for success and failure, a random sample of 4,771 adults between the ages of 23 and 49 was screened by the Stanford Binet Form L and a vocabulary test. From this sample, the estimated retardation rate for Puerto Rican adults was 31%. Success was measured by comparing the average income of male retardates with the incomes of other males in the same community; those in the lowest 20% were considered unsuccessful. The proportion of successful retardates was dependent on the complexity of the community; in peasant communities, 78% were successful while in urban non-slums this was reduced to 60%. Intelligence and education contributed to the probability of success, especially for those with IQ's of 85 or above; however, in urban areas retardates with 4 years or less of school had a failure rate of 50% while for those with more schooling the rate was 30%. Over 60% of respondents had a positive self image although normals and successful retardates showed more positive self images (p=.05). Most retardation resulted from cultural deprivation. (MK)