This healthy growth was helped materially by the public demand for the improvement of several of the national parks. No thought of appropriating money to improve the bathing facilities of Hot Springs had affected Congressional action for nearly half a century; it was enough that the curative springs had been saved from private ownership. Yellowstone was considered so altogether extraordinary, however, that Congress began in 1879 to appropriate yearly for its approach by road, and for the protection of its springs and geysers; but this was because Yellowstone appealed to the public sense of wonder. It took twenty years more for Congress to understand that the public sense of beauty was also worth appropriations. Yosemite had been a national park for nine years before it received a dollar, and then only when public demand for roads, trails, and accommodations became insistent. [Illustration: _From a photograph by Pillsbury_ THE YOSEMITE FALLS--HIGHEST IN THE WORLD From the brink of the upper falls to the foot of the lower falls is almost half a mile] But, once born, the idea took root and spread. It was fed by the press and magazine reports of the glories of the newer national parks, then attracting some public attention. It helped discrimination in the comparison of the minor parks created in 1903 and 1904 with the greater ones which had preceded. The realization that the parks must be developed at public expense sharpened Congressional judgment as to what areas should and should not become national parks. From that time on Congress has made no mistakes in selecting national parks. Mesa Verde became a park in 1905, Glacier in 1910, Rocky Mountain in 1915, Hawaii and Lassen Volcanic in 1916, Mount McKinley in 1917, and Lafayette and the Grand Canyon in 1919. From that time on Congress, most conservatively, it is true, has backed its judgment with increasing appropriations. And in 1916 it created the National Park Service, a bureau of the Department of the Interior, to administer them in accordance with a definite policy. V The distinction between the national forests and the national parks is essential to understanding. The national forests constitute an enormous domain administered for the economic commercialization of the nation's wealth of lumber. Its forests are handled scientifically with the object of securing the largest annual lumber output consistent with the proper conservation of the future. Its spirit is commercial. The spirit of national park conservation is exactly opposite. It seeks no great territory--only those few spots which are supreme. It aims to preserve nature's handiwork exactly as nature made it. No tree is cut except to make way for road, trail or hotel to enable the visitor to penetrate and live among nature's secrets. Hunting is excellent in some of our national forests, but there is no game in the national parks; in these, wild animals are a part of nature's exhibits; they are protected as friends.