Melbourne: Heinemann, 1956. hardcover. 3 volumes. 8vo, red cloth, d.w.; spine and portion of front and rear covers of volume 3 dampstained, dust wrappers lightly worn. Melbourne: William Heinemann, (1956). Volume 3 is New York: Macmillan, (1961). A very good set. very good / very good(-).
Volume One: On the Diversity of Morals; Volume Two: Reason and Unreason in Society; Volume Three: Evolution and Progress.