In 1860-61 gold was discovered in Montana, and prospectors began to extend their search for the precious metal into adjoining territory. The Indians were troublesome; nevertheless many prospectors ventured into the region of the Upper Yellowstone during the years succeeding, and reported seeing wonderful volcanic agencies at work. To settle the many flying accounts about volcanic wonders in the Yellowstone section, two expeditions headed by prominent citizens of Montana were formed to ascertain the truth concerning these statements. The expeditions set out during the consecutive years 1869 and 1870. On their return excellent descriptions of what they had seen were published in the Montana papers, and these accounts were copied by the leading papers of the country. The second, or Washburn-Doane, expedition of 1870 was the most successful in its explorations, since it was provided with a military escort. One of the members of this expedition wrote up a series of excellent articles which were published in _Scribner's Magazine_, thus giving further authenticity and wide publicity to the discovery. In 1871 interest awakened by the last expedition caused the United States Government to send out a special expedition of geological and engineering men to collect exact data, take photographs, and make a survey of the Yellowstone region. The geological section was under the direction of Dr. P. V. Hayden. Mainly through Hayden's influence and foresight Congress withdrew the tract now comprising Yellowstone National Park from occupancy or sale, and dedicated and set it apart as a public park or pleasure ground for the benefit and enjoyment of the people. The bill was signed by the president March 1, 1872. In 1872 two United States geological surveying parties were sent out and detailed explorations were made during the next ten years. The park is now under the management of a military commander as acting superintendent, aided by a detachment of United States troops, who maintain order, prevent acts of vandalism, and see that the rules and regulations of the park are obeyed. No one except the troops is allowed to bring firearms into the park, and the wild animals, now carefully protected by law, have greatly multiplied. Through subsequent acts of Congress two forest reserves have been added to the park proper, the Madison Forest Reserve in 1902 and the Yellowstone Forest Reserve in 1903. These additions make the total area reserved from settlement about seventeen thousand six hundred square miles. The only living beings that are permitted to fell as many trees as they wish are the beavers, which use them in constructing their dams. The grizzly and the black bear flourish in the park and have become quite tame. In the neighborhood of the camps and hotels they have become an intolerable nuisance because of their propensity to break into tents and buildings in search of food.