ABSTRACT
This is another paper which Foulkes was invited to contribute to a series of articles on a given theme, a symposium spread over two issues of the journal. Authors whose contributions are published in the same issue as Foulkes’ are Reuben Fine, Jerome Frank, William Schutz, Melitta Schmideberg and S. R. Slavson. The version printed here includes some passages omitted from that originally published.
