On your map you will easily find, on the eastern shore of Mexico, the city of Tampico, located in the center of the palm of the hand with which Mexico grasps the great Gulf. A little to the south you will find, with difficulty, the town of Tuxpam, midway between Tampico and Vera Cruz. From Tampico directly south to a few miles west of Tuxpam runs the “line” along which lies virtually all the oil yet developed in commercial quantities in Mexico. The “line” is thirty-five miles long; the great producing territory never extended over twenty miles; momentarily the section which is giving the oil of the Tuxpam district is along ten miles in the middle of the “line”--and the territory is hardly a half mile broad at its greatest width. This section produced in the past ten years 500,000,000 barrels of oil. In 1920 it produced about 140,000,000 barrels, close to one-quarter of all the oil taken from all the wells in the world. Now trace the “line” north to Texas and Oklahoma--it is an extension of the great mid-continent field of the United States. Now go south, through the old Furbero field, swing a little in toward the Gulf, and south of Vera Cruz, on the Isthmus of Tehuantepec, you will find Minatitlan, the site of early drillings, and of the refinery of the Mexican Eagle Oil Company. Still south, on the “line,” and you will find, if your map is large enough, the village of Macuspana, in the state of Tabasco. Here oil of a grade so fine that the natives burn the crude seepage in their lamps has been oozing through the soil for centuries, and here, long ago, the British drilled many test holes. The “line” runs true, skirting the Gulf of Mexico. Still more. There are oil seepages on the West Coast, an extension, perhaps, of our California fields. Other indications have been found, even far inland, and indeed on the Gulf side, the “line” does not by any means cover the seepages, even of the coastal plain. All this section, off into the interior toward the states of Puebla and Hidalgo, has been leased for oil. But production sticks to the “line.”