He translated Aucassin et Nicolette as Aucassin and Nicolet (1887), and he wrote the scholarly The Early Editions of the Roman de la Rose (1906) as well as Russia Reborn (1917) and various essays which the Religious Tract Society published.
He was one of the founders of the British and Foreign Bible Society, the Religious Tract Society, and the London Missionary Society, and was secretary to the last-named for several years.
In 1855 Milner's Essentials of Christianity, theoretically and practically considered, which had been left in manuscript, and had been revised by his brother, was edited for the Religious Tract Society by Mary Milner, the orphan niece of whom Joseph Milner had taken charge, and writer of her uncle Isaac's Life.
From the 1860s, the Society began publishing novels aimed at women and children, providing a platform for a new generation of women writers, including Rosa Nouchette Carey.
Tregellas was the author of an anonymous volume on China, the Country, History, and People, published by the Religious Tract Society (1867).
He was an apologist author of two books, Westbourne Grove Sermons and The Trades and Industrial Occupations of the Bible, published by the Religious Tract Society.
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