CopyrightLife + 70 yearsPublic domainThe last author or translator died in 1948; public domain since 2019.United StatesStatus unknownPublished in 1948; its copyright notice and renewal have not been checked.
Read to the British Psycho-Analytical Society in 1943 as the opening paper of the Controversial Discussions, and later reprinted in Developments in Psycho-Analysis (1952).