The social creeds of the Christian churches will remain the expressions of vague aspirations until they are supplemented by the knowledge essential to their concrete definition. Men and women who profess allegiance to the Great Commandments of Jesus have come to realize that the Kingdom of God on Earth, the Brotherhood of Man, cannot be built by fiat or verbal proclamation. The building of a worthy civilization is as definitely an engineering enterprise as the building of the Panama Canal. It demands a scientific procedure and a patient devotion as thoroughgoing as that which during the past two hundred years has gone into the development of the steam engine, the aeroplane, or high-tension electric transmission. The theory of nationalization, like the theory of collective bargaining and the traditional theory of progress by free competition, must each be tested, as the existing social and industrial order must be tested, in the light of painfully ascertained facts, and in terms of their effect upon the individual personality. For it is only in the light of the truth that we shall be able to build a civilization in which the individual personality may find full fruition. It is only by the aid of knowledge and human understanding that we shall be able to resolve the drama of civilization into a victory of the consciousness of kind over the warfaring acquisitive instinct. It is only by making the technique of science obedient to the Great Commandments of Jesus that we shall be able to build a civilization worthy of a world that moves through infinite space with the sun and the marching stars. WHAT TO READ A SELECT LIST _American Economic Review_. New Haven, Conn. Supplement. March, 1921. ARCHBALD, HUGH $Four-Hour Day in Coal.$ N. Y. H. W. Wilson Co. 1922. 148 pp. BLOCH, LOUIS $Coal Miners' Insecurity;$ Facts about Irregularity of Employment in the Bituminous Coal Industry in the United States. N. Y. Russell Sage Foundation. 1922. 50 pp. BROPHY, JOHN See United Mine Workers of America, District No. 2, and United Mine Workers of America, Nationalization Research Committee. CAMPBELL, M. R. $Coal Fields of the United States.$ Wash. Govt. Printing Office. 1917. 33 pp. (U. S. Geological Survey. Prof. paper. 100-4.) Map, tables, diagrams. COMMONS, J. R., ed. $Trade Unionism and Labor Problems,$ 2d series. Boston. Ginn & Co. 1921. 838 pp. Contains: Edgar Sydenstricker. Settlement of Disputes under Agreement in the Anthracite Industry. pp. 495-524. Ethelbert Stewart. Equalizing Competitive Conditions. pp. 525-533. COMMONS, J. R., and others $History of Labour in the United States.$ N. Y. Macmillan Co. 1918. 2 vols. ECKEL, E. C. $Coal, Iron and War;$ A Study in Industrialism, Past and Future. N. Y. Henry Holt & Co. 1920. 375 pp.