Migratory farm workers provide the extra hands that are so badly needed during the planting and harvest season in the United States. Although these workers have been essential to the American agricultural system for more than a hundred years, our knowledge of them is limited and quite fragmentary; it can be divided roughly into two types of information. On the one hand, we have the statistical data collected by various censuses and the data gathered by agricultural econ omists to study the supply of and demand for farm labor. The economic aspects of farm labor generally predominate in such...