On Paul Federn's death, the author inherited from him Freud's Hemmung, Symptom und Angst. Federn had used this copy in a seminar he had conducted and had sprinkled it liberally with marginal annotations. These fall into two categories: views on the nature and functioning of the ego and of anxiety. The author discusses only those marginalia which deal with the interrelationship between the two. He concludes that Freud and Federn concentrate on different aspects of the ego and that their views are complementary. Federn speaks mainly of the sensory-affective states of the ego at its core and at its boundary with other structures of the self and of the outer world. Freud deals more with the specific integrating and problem solving functions of the ego. Consistent with their interests, Freud was more involved with the neuroses and Federn with the psychoses.