The 13th Conference of French-speaking psycho-analysts will be devoted to the discussion of the relation of psycho-analysis to criminology. This has been decided on in anticipation of the 2nd International Congress of Criminologists, which will shortly meet in Paris. Psycho-analysis has made a very important contribution to modern criminology. The fact that infantile traumas play their part in the genesis of crime has thrown new light on the problem of criminal responsibility. Psycho-analysts are well aware of the practical difficulties with which modern criminology is faced, but they will insist on pointing out the contradictions in the present methods of administering the law. They will not be content with the simple alternative of asylum or prison. Psycho-analytic treatment in prisons is difficult, if not impossible, and some new way will have to be found in consequence of the contributions of psycho-analysis to criminology.