This pre-Mexican War, pre-gold-rush immigration takes a prominent place in the history of the state, and the tragedy and success of its participants provide a story of engrossing interest. They had forced their slow way across the continent to find a permanent home beside the western sea, and their arrival presaged the overthrow of Mexican rule in California. The Mexican, Castro, stated before an assembly in Monterey: “These Americans are so contriving that some day they will build ladders to touch the sky, and once in the heavens they will change the whole face of the universe and even the color of the stars.” In one of the parties of settlers was a man of no signal traits, who, by a chance discovery, was to set the whole world agog. This was James W. Marshall, an employee of John A. Sutter of the Sacramento. On January 24, 1848, he found gold in a millrace belonging to Sutter. About a week later the inevitable took place. California became a part of the United States. The news of the gold discovery spread like wildfire, and by the close of 1848 every settlement and city in America and many cities of foreign lands were affected by the California fever. Gold seekers swarmed into the newly acquired territory by land and by sea. The overland routes of the fur trader and the pioneer settler found such a use as the world had never seen. From the Missouri frontier to Fort Laramie the procession of Argonauts passed in an unbroken stream for months. Some 35,000 people traversed the Western wilderness and 230 American vessels reached California ports in 1849. The western slope of the Sierra from the San Joaquin on the south to the Trinity on the north was suddenly populous with the gold-mad horde. On May 29, the _Californian_ of Yerba Buena issued a notice to the effect that its further publication, for the present, would cease because its employees and patrons were going to the mines. On July 15 its editor returned and published an account of his personal experiences as a gold seeker. He wrote: “The country from the Ajuba [Yuba] to the San Joaquin, a distance of about 120 miles, and from the base toward the summit of the mountains ... about seventy miles, has been explored and gold found on every part.” By 1849 the Mariposa hills were occupied by the miners, and the claims to become famous as the “Southern Mines” were being located. Jamestown, Sonora, Columbia, Murphys, Chinese Camp, Big Oak Flat, Snelling, and Mariposa, all adjacent to the Yosemite region, came to life in a day. Stockton was the immediate base of supply for these camps. The history of Mariposa is replete with fascinating episodes. May Stanislas Corcoran, a daughter of Mariposa, has supplied the Yosemite Museum with a manuscript entitled “Mariposa, the Land of Hidden Gold,” which comes from her own accomplished pen. From it the following brief account is abstracted as an introduction to the beginnings of human affairs in the Mariposa hills.