Meanwhile, Acton became the Editor of the Roman Catholic monthly paper, The Rambler, in 1859, upon John Henry (later Cardinal) Newman's retirement from the editorship. In 1862, he merged this periodical into the Home and Foreign Review. His contributions at once gave evidence of his remarkable wealth of historical knowledge. Though a sincere Roman Catholic, his whole spirit as a Historian was hostile to ultramontane pretensions, and his independence of thought and liberalism of view speedily brought him into conflict with the Roman Catholic hierarchy. As early as August 1862, Cardinal Wiseman publicly censured the Review; and when in 1864, after Döllinger's appeal at the Munich Congress for a less hostile attitude towards historical criticism, the pope issued a declaration that the opinions of Catholic Writers were subject to the authority of the Roman congregations, Acton felt that there was only one way of reconciling his literary conscience with his ecclesiastical loyalty, and he stopped the publication of his monthly periodical. He continued, however, to contribute articles to the North British Review, which, previously a Scottish Free Church organ, had been acquired by friends in sympathy with him, and which for some years (until 1872, when it ceased publication) promoted the interests of a high-class Liberalism in both temporal and ecclesiastical matters. Acton also did a good deal of lecturing on historical subjects.