The author emphasizes the role of early excessive aggressive and libidinal impulses in perversion formation and the introjective-projective defences utilized to deal with them. In the case quoted the perversion appeared whenever the patient was in an emotional crisis. The child chosen for the act was a narcissistic object. The object was split with the boy representing the patient himself and the other part of the split representing the destructive and castrated mother. Idealization of the object avoided anxiety and guilt.