Sierra Nevada. For the Sierra Club, which is interested primarily in conservation, mountaineering activities are administered by a Mountaineering Committee, at present under the chairmanship of Morgan Harris. Local rock climbing committees conduct activities in the field. A subcommittee on safety plans an educational program and carefully investigates such accidents as do occur. Rescue techniques are practised on local cliffs, and latest developments discussed at evening meetings. A classification of climbers has been completed, for better control of safety, and a copy of the classification furnished to the National Park Service. For nearly ten years an expert climber has been recommended to the Superintendent of Yosemite National Park as a temporary ranger during the height of the tourist season.