A radical is a person who holds extreme or unconventional convictions and who advocates fundamental political, economic, or social reforms. In this volume, the Scottish philosopher, John MacCunn, presents the life and thought of Jeremy Bentham, John Stuart Mill, Richard Cobden, Thomas Carlyle, Giuseppe Mazzini, and Thomas Hill Green-- six radical thinkers whose influence produced fundamental and progressive change in 19th century society. - Summary by Pamela Nagami, M.D.