Speech and Voice

original contribution to the psycho-pathology of childhood. Dr. Stein's evolutionary interpretation of speech abnormalities illuminates some of the dark places of therapeutic work. The fundamental concept of growth, though accepted and applied without question in the study of the motor, intellectual, social and linguistic behaviour of children, had not hitherto been applied exhaustively and rigorously to the study of speech defects. The mass of observations made in this field lacked cohesion and awaited a unifying principle. It is satisfying that it is again the principle of evolution, the idea of growing by a natural process, that enables Dr. Stein to arrange and systematize most of the known abnor-