DISCUSSION: Dr. Theodore Lipin suggested that the question about the source of aggression be altered as follows: 'What physiological activity patterns (or processes) of aggression are reciprocally related to psychological patterns of aggression?'. Regarding the aim, he feels that all aggressive activity patterns have in common the over-all aim of 'differentiation of the organism at the expense of and peril to everything else'. In view of the fact that our clinical examples are composed of blended derivatives of aggressive and libidinal activity patterns, we cannot make a scientific inference about the discharge characteristics of pure aggressive activity.