The Jubilee of the Constitution, 1839; 24.

A Discourse on Education, delivered at Braintree, 1840; 25.

An Address at the Observatory, Cincinnati, 1843.
Among the unpublished works of Mr.Adams, besides his Diary, which extends over half a century, and would probably make some two dozen stout octavos, are Memoirs of the earlier Public and Private Life of John Adams, second President of the United States, in three volumes; Reports and Speeches on Public Affairs; Poems including two new cantos of Dermot McMorrogh, a Translation of Oberon and numerous Essays and Discourses."] No man was more familiar with modern history, with diplomacy and international law, and the politics of America and Europe for the last two or three centuries.
In other departments he appeared equally at home.

His acquaintance was familiar with the classics, and several modern languages.

In oratory, rhetoric, and the various departments of belles lettres, his attainments were of more than an ordinary character.