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The author engages in some interesting random thoughts stimulated by Lorenz's studies on aggression in animals. Cautioning against the pitfalls of drawing exact analogies between animal and human behavior, Spitz nonetheless manages to present some useful comparisons between certain phylogenetic developments in animals and ontogenetic processes in man. Regulatory principles of animal instincts are seen as related to, although not identical with, the psychological handling of drives in the human organism.