The Park Naturalist position in Yosemite National Park has been held by Ansel F. Hall, 1922-1923; Carl P. Russell, 1923-1929; C. A. Harwell, 1929-1940; C. Frank Brockman, 1941-1946; and now, Donald Edward McHenry. These men and their assistants have supervised the naturalist activities including the Yosemite Museum program, directed the Yosemite School of Field Natural History, and the activities of the Yosemite Natural History Association, including the editing and publishing of _Yosemite Nature Notes_. This last-named organization has existed since 1924 as a society coöperating with the National Park Service in advancing the work of the Yosemite Naturalist Department. It is the successor of the Yosemite Museum Association formed by Ansel F. Hall in 1920. On April 24, 1925, members of its advisory council and board of trustees defined these purposes of the Association: 1. To gather and disseminate information regarding birds, mammals, flowers, trees, Indians, history, geology, trails, scenic features, and other subjects so well exemplified by Nature in Yosemite National Park and elsewhere in the Sierra Nevada. 2. To develop and enlarge the Yosemite Museum (in coöperation with the National Park Service) and to establish subsidiary units, such as the Glacier Point Lookout and branches of similar nature. 3. To contribute in every way possible to the development of the educational activities of the Yosemite Nature Guide Service. 4. To publish (in coöperation with the National Park Service) _Yosemite Nature Notes_, a periodical containing articles of scientific interest concerning the matters referred to in this statement of purposes. 5. To promote scientific investigation along the lines of greatest popular interest and to publish from time to time bulletins or circulars of a nontechnical nature. 6. To maintain in Yosemite Valley a library containing works of historical, scientific, and popular interest. 7. To study the living conditions, past and present, of the remaining Indians of the Yosemite region, for the purpose of preserving their arts, customs, and legends. 8. To strictly limit the operations, business, property, and assets of the association to purposes which shall be scientific and educational, in order that the association shall not be organized, constituted, or operated for profit, and so that no part of the net income of the association shall inure to the benefit of any member or other party thereto.