Later, in March 1829, he travelled through Greece as assistant director of the archaeological department of the Morea scientific expedition. On his return he was appointed curator of the works of art in the Royal Library. Although the chair was that of modern history, he lectured chiefly on ancient history, particularly the origins of Greek civilization. In 1836 he was appointed curator of printed books in the Royal Library, and in 1839 was elected a member of the Academy. In 1840 he was made curator of the Cabinet of Medals.