- A Political History of Slavery: Being an Account of the Slavery Controversy From the Earliest Agitations in the Eighteenth Century to the Close of the Reconstruction Period in America; Volume 2
- Two Speeches at the Queen's Jubilee, London, 1897
- The Monroe Doctrine, the Polk Doctrine and the Doctrine of Anarchism
- One Welshman: A Glance at a Great Career. Inaugural Address, Autumn Session, University College of Wales, Aberystwyth, October 31st, 1912
- Problems of Expansion, as Considered in Papers and Addresses