THIS BOOK REPORTS A CULTURAL-HISTORICAL STUDY OF THE ENVIRONMENT AND BEHAVIOR PATTERNS OF CERTAIN PUERTO RICAN SUBCULTURES. THE AIMS OF THE STUDY WERE TO ANALYZE THE CONTEMPORARY CULTURE AND TO EXPLAIN IT IN TERMS OF THE HISTORICAL CHANGES WHICH HAVE OCCURRED ON THE ISLAND, AND TO DETERMINE HOW THESE HISTORICALLY DERIVED PATTERNS HAVE BEEN ADAPTED TO THE LOCAL GEOGRAPHIC ENVIRONMENT. THE BOOK CONTAINS AN OVERVIEW OF PUERTO RICO'S HISTORY AND SEPARATE FIELD STUDIES OF FIVE REGIONAL SUBCULTURES--A TOBACCO AND MIXED CROPS MUNICIPALITY, A "TRADITIONAL" COFFEE MUNICIPALITY, THE WORKERS ON A GOVERNMENT-OWNED SUGAR PLANTATION, A RURAL SUGAR PLANTATION PROLETARIAT, AND THE PROMINENT FAMILIES OF SAN JUAN. SUCH SOCIAL INSTITUTIONS AS EDUCATION, FAMILY LIFE, POLITICS, AND RELIGION ARE DISCUSSED IN THESE STUDIES. THE BOOK ALSO CONTAINS A COMPARATIVE ANALYSIS OF THE REGIONAL SUBCULTURES, A DISCUSSION OF NATIONALITY IN PUERTO RICO, AND SOME OBSERVATIONS ABOUT CULTURAL CHANGE IN PUERTO RICAN AND OTHER CULTURES. THIS DOCUMENT IS AVAILABLE FOR $10.00 FROM UNIVERSITY OF ILLINOIS PRESS, URBANA, ILLINOIS. (EF)