To Our Readers TheArchiveseditorial office has moved. Please address all future correspondence, including submitted manuscripts and LETTERS TO THE EDITOR, to Daniel X. Freedman, MD, Archives of General Psychiatry, UCLA Neuropsychiatric Institute, 760 Westwood Plaza, Los Angeles, CA 90024. To the Editor.— In a recent article by Zitrin et al (Archives1983;40:125-138) the following statement appeared: Although the pharmacologic approach has led to the differentiation of panic attacks from chronic anxiety, Klein believed that neither psychoanalysis nor learning theory makes this discrimination and, therefore, neither theory can deal with these findings. It is true that Freud did not regard chronic anxiety and panic attacks as etiologically distinct. Nevertheless, it is worth noting that in his 1917 lecture on anxiety (lecture 25 of the Introductory Lectures on Psychoanalysis 1 ) Freud clearly differentiated the three major clinical manifestations of anxiety: If we now pass over to consider neurotic anxiety, what