Having proved himself an able palaeographer, he was sent out by the British government under Henry John Temple, 3rd Viscount Palmerston to inspect the libraries in the monasteries of the Levant in 1857. He discovered some valuable manuscripts, but the monks were too wise to part with their treasures. One valuable result of his travels was the detection of the forgery attempted by Constantine Simonides. He was the author of various catalogues, and under his direction that of the Bodleian, in more than 720 volumes, was completed. He published Rogri de Wendover Chronica, 5 vols. (1841-1844); the Black Prince, an historical poem written in French by Chandos Herald (1842); and Report on the Greek Manuscripts yet remaining in the Libraries of the Levant (1858).
He was not only an accurate librarian but an active and hardworking clergyman, and was for the last twenty-five years of his life in charge of the parish of Wytham, near Oxford. He was likewise honorary fellow of Worcester and Corpus Christi.