In 1916 Congress created the National Park Service. Dr. Miller, in the meantime, had been called to other work, and Stephen T. Mather, who had followed Dr. Miller as assistant to the secretary, was made Director of the National Park Service. He was authorized by law to “promote and regulate the federal areas known as the national parks, monuments, and reservations.” Conservation of scenery and wildlife of the areas was declared by Congress to be a fundamental purpose of the new organization. Mr. Mather’s first undertaking was to balk exploitation schemes. Unfortunately, Yosemite had already been raided. In 1913 Congressman John E. Raker had introduced a bill granting to San Francisco rights to the Hetch Hetchy as a water reservoir. Secretary Garfield had opened the way to this move in 1908. In spite of much opposition, the Raker Bill was passed by the House and Senate and approved by President Wilson. Since that time the Hetch Hetchy dam has become a reality and provides all the administrative difficulties and troubles that were expected.[22] Private holdings in Yosemite were rather large even after the boundary changes of 1905 and 1906 were made. Timber companies possessing tracts of choice forest constituted the greatest menace. Some of these private lands have been bought up, and others have been exchanged. During 1930 much progress was made in the acquisition of private holdings in the national park. There were 15,570 acres of land involved, which cost approximately $3,300,000. Half of the cost of purchasing these lands was defrayed by John D. Rockefeller, Jr., the remainder coming from the fund provided by Congress for the acquisition of private holdings in national parks. The following statements regarding timber holdings in and near Yosemite National Park are taken from the Report of the Director of National Park Service for 1930: It is impossible to overestimate the importance of this Yosemite forest acquisition. It brought into perpetual Government ownership the finest remaining stands of sugar-pine timber in the area and reduced the total area of private holdings in that park to 5,034 acres. This total will be materially reduced when two pending deals are consummated. A tract containing 640 acres is now in course of acquisition with funds contributed by George A. Ball, of Muncie, Indiana, as is another of about 380 acres, half the funds for the latter transaction being contributed through the co-operation of Dr. Don Tresidder, president of the Yosemite Park and Curry Company. Additional timber holdings in the Tuolumne River watershed—fine stands of sugar and yellow pine—remain in private ownership outside the park. One cannot help regretting that they are imperiled, and it is hoped by all friends of these majestic forests that they may yet be saved.