Book Review: One Lord, One Church. By J. Robert Nelson. World Christian Books. 2s. 6d; Members One of Another. Aspects of Koinonia. By J. G. Davies. Mowbray. 3s; The Recovery of Unity. A Theological Approach. By E. L. Mascall. Longmans. 25s; The Christian Tradition and the Unity We Seek. By Albert C. Outler. Oxford University Press. 12s. 6d