T HE Modern Missions Movement is a self-constituted body of missionary supporters which proposes to operate outside the official organizations, but nevertheless within the total enterprise, functioning co-operatively with other missionary bodies in so far as possible along the lines indicated below for the purpose of quickening afresh enthusiasm for the cause of missions, and also of bringing to bear upon this worthy cause the contributions which come from investigation, appraisal, and discriminating promotion. The actual organization consists of a National Committee, composed of I50 prominent clergymen, laymen, and laywomen, which is consulted on the major issues of policy. This body operates through three committees: an Executive Committee, which is responsible for the direction of the Movement; a Research Committee with its office in New Haven; and an Educational Committee. The inner significance of this Movement will be revealed by viewing it under three aspects: first as a recent manifestation of a larger and longer movement within the missionary enterprise which has been gathering momentum for twenty years; second, in the light of the functions which it proposes to perform; and, third, as one of the latest phases of the perennial problem of how to relate diversity of conviction to unity of fellowship and co-operative action.