Place of publication: London
Collation: xvi, 140 p. ; 22 cm.
Notes: Includes bibliographical references and index. Printed in two columns. Published for the Rationalist Press Association. Part of the NSS pamphlet collection.
Place of publication: London
Collation: 30, [1] p. ; 19 cm.
Notes: "Mr Watts's writings" on unnumbered page at the end. Part of the NSS pamphlet collection.