Birney, who had now become discouraged regarding the prospect of emancipation, during the winter of 1831 and 1832 decided to remove his family to Jacksonville, Illinois. He was deterred from carrying out his plan, however, by his unexpected appointment as agent of the colonization society in the Southwest--a mission which he undertook from a sense of duty. In his travels throughout the region assigned to him, Birney became aware of the aggressive designs of the planters of the Gulf States to secure new slave territories in the Southwest. In view of these facts the methods of the colonization society appeared utterly futile. Birney surrendered his commission and, in 1833, returned to Kentucky with the intention of doing himself what Henry Clay had refused to do three years earlier, still hoping that Kentucky, Virginia, and Tennessee might be induced to abolish slavery and thus place the slave power in a hopeless minority. His disappointment was extreme at the pro-slavery reaction which had taken place in Kentucky. The condition called for more drastic measures, and Birney decided to forsake entirely the colonization society and cast in his lot with the abolitionists. He freed his slaves in 1834, and in the following year he delivered the principal address at the annual meeting of the American Anti-Slavery Society held in New York. His gift of leadership was at once recognized. As vice-president of the society he began to travel on its behalf, to address public assemblies, and especially to confer with members of state legislatures and to address the legislative bodies. He now devoted his entire time to the service of the society, and as early as September, 1835, issued the prospectus of a paper devoted to the cause of emancipation. This called forth such a display of force against the movement that he could neither find a printer nor obtain the use of a building in Dansville, Kentucky, for the publication. As a result he transferred his activities to Cincinnati, where he began publication of the Philanthropist in 1836. With the connivance of the authorities and encouragement from leading citizens of Cincinnati, the office of the Philanthropist was three times looted by the mob, and the proprietor's life was greatly endangered. The paper, however, rapidly grew in favor and influence and thoroughly vindicated the right of free discussion of the slavery question. Another editor was installed when Birney, who became secretary of the Anti-slavery Society in 1837, transferred his residence to New York City.