It was Charles Briggs who first gave definite purpose to the missionary work of the Association. The annual report of 1850 said of him that he "had led the institution forward to high ground as a missionary body, by unfailing patience prevailed over every discouragement, by inexhaustible hope surmounted serious obstacles, by the most persuasive gentleness conciliated opposition, and done perhaps as much as could be asked of sound judgment, knowledge of mankind, and devotion to the cause, with the drawback of a slender and failing frame." In 1845 Rev. George G. Channing entered upon a service as the travelling agent of the Association, which he continued for two years. His duties required him to take an active interest in missionary enterprises, revive drooping churches, secure information as to the founding of new churches, and to add to the income of the Association. He was a brother of Dr. Channing, held one or two pastorates, and was the founder and editor of The Christian World, which he published in Boston as a weekly Unitarian paper from January, 1843, to the end of 1848. At a meeting of the Unitarian Association held on June 3, 1847, the final steps were taken that secured its incorporation under the laws of Massachusetts. In the revised constitution the fifteen vice-presidents were reduced to two, and the president and vice-presidents were made members of the executive committee, and so brought into intimate connection with the work of the Association. The directors and other officers were made an executive committee, by which all affairs of moment must be considered; and it was required to hold stated monthly meetings. These changes were conducive to an enlarged interest in the work of the Association, and also to the more thorough consideration of its activities on the part of a considerable body of judicious and experienced officers. They were made in recognition of the increasing missionary labors of the Association, and enabled it thenceforth to hold and to manage legally the moneys that came under its control. [Sidenote: Publication of Tracts and Books.]