The spread of knowledge, particularly that regarding electric furnaces, makes the control of the tungsten trade through secret processes or superior skill extremely difficult, and so far as the United States, Great Britain and France are concerned, gives little advantage to any one. Japan is perhaps somewhat less advantageously placed. Smelting plants are so easily, quickly and cheaply erected that they do not offer any great chance for monopoly. Cheap power, high technical skill and knowledge, originality and boldness in experiment, excellence of organization, generous dealing with producers, an honest product honestly sold, good transportation facilities, and broad sane laws are the elements that will give control. The United States may have this control through reasonable effort, but selfish laws may still more easily wreck control of the larger part of the world’s trade, reduce our tungsten business to a provincial scope, and make the product high priced for all time. WHAT CONTROL MEANS IN THE UNITED STATES In years of good business before the World War, the United States used an equivalent of 3,000 to 4,000 short tons of concentrates, carrying 60 per cent. WO₃ per annum. When the war began there was a lull while the attacked countries caught their breath and prepared for a long struggle. After plans had been made, and the manufacture of munitions had begun on a grand scale, the demand for tungsten rose enormously. All kinds of ores were taken at fabulous prices. Ores carrying tin, phosphorus, sulphur and bismuth, that before would not have been considered by steel makers, were taken with avidity, and there was a great scramble for deposits. In October, 1918, the United States was using tungsten ores at the rate of 20,000 tons per annum. Meanwhile prospecting had uncovered so many new deposits and they were so actively exploited that great stocks of ores were accumulated in the Entente countries. On the other hand, in this country many of the known deposits showed signs of impoverishment, a number after being worked profitably for a short time became wholly inoperative, and it is likely that some of the deposits that have seemed to be the richest will never again produce largely. Among the new discoveries were the contact metamorphic deposits of the Great Basin, in California, Nevada and northeastern Utah. They were partly developed, and several promise well, but the irregularity of contact metamorphic ore deposits is notorious.