A leading article on Dr. Pailthorpe's report 'Studies in the Psychology of Delinquency', issued by the Medical Research Council. The article is sympathetic, but calls attention to the restricted nature of the case material as a basis for generalization and the greater stress which might be laid on environmental factors in the aetiology of delinquency. 'Then again, other observers might be less optimistic as to the beneficial results of psycho-analysis or other forms of psychotherapy in these cases.'