survey was published, however, an invention has been announced which greatly increases the distance over which the high-voltage currents can be efficiently sent, so that it is now feasible to transmute a much larger proportion of coal into electricity at the mine. The plan for practically all the tidewater generating plants can be given up, together with the long, slow, costly process of carrying coal to them, and that ninety per cent of the electricity for the superpower system which is derived from coal can be generated directly at the mine. The other ten per cent according to the Commission's plan will be hydroelectric power. Generating stations are to be established at the rapids of the Potomac just above Washington; along the lower reaches of the Susquehanna in Pennsylvania and Maryland; along the upper courses of the Delaware and the Hudson; in the Adirondacks; and at intervals along the whole length of the Connecticut River. But the main dependence of the projected superpower system is still the bituminous coal supply which it is planned to keep at its old job of raising steam to drive the turbine engines which will in turn drive the electric dynamos. Besides the Commission's superpower plan for the Atlantic seaboard, other power systems have been sketched out, one centering around Helena in southern Illinois and designed to serve most of the Mississippi Valley, one near the northwest coast, another in California. The integration of water and coal is a long step toward the solution of the power problem, in that it not only brings a new force to supplement the coal supply but also saves the coal now used by steam locomotives to haul raw fuel to its millions of consumers. Moreover, it contemplates the electrification of all the railroads within the zone whose traffic is heavy enough to warrant it, and as it is estimated that two pounds of coal applied to an electric locomotive will do as much work as seven and one-half to eight and one-half pounds when applied to a steam locomotive, the amount of coal now used for transportation will be still further reduced. Through such beginnings as these projected superpower systems must come the comprehensive integration of the industry.