Among those who are engaged in practical clinical work for determining mental development the Binet Scale has advocates who are quite as ardent as critics we have noted. Goddard, Kuhlmann (_139_), Wallin (_213_), and Towne (_201_), have all used it in the practical examination of hundreds of cases and heartily commend its use in connection with delinquents, as does Healy for the earlier ages (_27_, p. 80). On the other hand there is a growing sentiment that the examinations should only be entrusted to experts in mental development. It is felt that the physician who has not had enough training in a psychological laboratory to understand the snares of mental tests, and very few have had this opportunity, ought to refer this question to a clinical psychologist as the best physicians now do when such experts are available. Perhaps nobody is so well equipped to judge a child's mental development without diagnostic tests as his school teacher, although Terman has shown that the teacher's judgment may be seriously at fault when he has not learned to dissociate mental capacity from the age and size of the child (_196_). In an editorial in the Journal of Criminology, Dr. Gault (_106_, p. 322) expresses the opinion that “dissatisfaction with mental tests as a means of diagnosis” is traceable to the fact “that what the lay mind recognizes as palpable errors are often made by half-trained 'investigators,' 'research directors' and even by men and women whose only qualification is that they have been trained for six weeks in a psychological clinic.” Dr. Wallin demands that the tests should be used for diagnosis only by the psychologist with clinical experience. The American Psychological Association has cautioned against diagnosis by those inadequately trained and adopted the following resolution at its 1915 meeting: “Whereas, psychological diagnosis requires thorough technical training in all phases of mental testing, thorough acquaintance with the facts of mental development and with the various degrees of mental retardation. “And whereas, there is evident tendency to appoint for this work persons whose training in clinical psychology and acquaintance with genetic and educational psychology are inadequate: “Be it resolved, that this Association discourages the use of mental tests for practical psychological diagnosis by individuals psychologically unqualified for the work.”