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Few of us realize that of the 4,200,000 children born annually in the United States, 142,800 will never achieve an intellect exceeding that of the 12-year-old child. In its sobering magnitude, this figure amply justifies the efforts of the authors of "Mental Subnormality" to review and integrate the known facts pertaining to retardation and to define pivotal points around which future research in this area may center. Under the auspices of the National Association for Retarded Children, Masland, Sarasan, and Gladwin bring to the reader a panoramic and sweeping view of a large number of studies in mental retardation. Often they pause in their review to call attention to the conceptual, methodological and attitudinal problems that stand in the way of the increased understanding of the subnormal individual. Thus, their scholarly review constitutes an excellent reference volume for the researcher in neurology, biochemistry, endocrinology, psychiatry, and psychology.
The plan of