Here is a book on problems in mental deficiency which is long overdue. It provides a well written, authoritative discussion of diagnostic criteria and classification, and a critical evaluation of current psychologic theories and practices in this field. It has the virtue of clarifying one's thinking about mental deficiency and of making one's approach to the problem sounder and more practical.
This reviewer feels that the pediatrician, along with other workers who deal with mentally defective children, will find this a tremendously valuable book.