First published in 1965, this work studies the House of Lords and the various proposals for its reform, abolition or limitation of its powers which have been made in the light o f prevailing theories of the nature and characteristics of the English government.

The work also contains a history of the theory of mixed government that arose in Tudor England and lasted until well after the Reform Act of 1832. This history both illuminates the position of the House of Lords and also provides perspective for the study of Democracy in the movement for parliamentary reform. One of the book's most original features is an extensive account of Charles I's Answer to the Nineteen Propostions, out of which came the startling new theory of the constitution, known as "mixed monarchy".