Established in 1823 as the official organ of the Philosophical Radicals, it was published from 1824 to 1914.

The Philosophical Radicals was a philosophically-minded group of English political radicals in the nineteenth century inspired by Jeremy Bentham (1748-1832) and James Mill (1773-1836).

Joseph Hamburger (1965) Intellectuals in Politics: John Stuart Mill and the Philosophical Radicals (Yale University Press)

William Thomas (1979) The Philosophical Radicals: Nine Studies in Theory and Practice (Oxford)

The Philosophical Radicals and Other Essays, with chapters reprinted on the philosophy of religion in Kant and Hegel (1907)

Upon his return to England, Trelawny became very politically active with a group known as the Philosophical Radicals.

The English Philosophical Radicals and Lower Canada, 1800-1835, McGill University (master's thesis)

While he was there he became involved with the Philosophical Radicals.

She had previously (in 1866) printed for private circulation a sketch entitled The Philosophical Radicals of 1832, including a Life of Sir William Molesworth.

Born into Unitarian Whig circles, Parkes developed an association with the Philosophical Radicals.