He is the author of many reviews, sermons, and magazine articles on literary, biographical, social, and political questions. He also wrote:
- Life and Correspondence of Theodore Parker (2 vols., New York, 1864)
- American Religion (1871)
He edited and translated:
- Friedrich von Hardenberg, Henry of Ofterdingen (a romance, Boston, 1842)
- Friedrich Schiller, Philosophical and Ęsthetic Letters and Essays (with an introduction, 1845)
- William Smith, Memoir of Johann G. Fichte (1846)