The National Park Service, the Forest Service, and the State of California have coöperated in making the John Muir Trail a reality. The phenomenal route had its inception during the 1914 Sierra Club Outing, when it was suggested to officers of the club that the State of California might well appropriate funds with which to develop trails in the High Sierra. Upon the death of John Muir, president of the club, appropriation bills were introduced for the purpose of creating a memorial trail. The first appropriation of $10,000 enabled the state engineer, Wilbur F. McClure, to explore a practical route along the crest of the Sierra from Yosemite to Mount Whitney. McClure made two trips into the Sierra and then conferred with the Sierra Club and officers of the U. S. Forest Service before designating the route. During the next twenty years several state appropriations were forthcoming, and the federal agencies most concerned, the Forest Service and the National Park Service, entered into the program of locating and building the trail. The earlier explorations of Muir, Solomons, LeConte, and numerous state and federal survey parties contributed to the success of the undertaking. The maps of the Geological Survey greatly facilitated the work. While Stephen T. Mather was still Assistant Secretary of the Interior and before the National Park Service was created, the “Mather Mountain Party of 1916” assembled in Yosemite Valley preparatory to an inspection of the John Muir Trail. This expedition received the support of the Geological Survey. Frank B. Ewing, at that time an employee of the Geological Survey, was chief guide and general manager. As an employee of the National Park Service, he has remained in Yosemite National Park ever since that early march along the John Muir Trail and has been a principal party to the National Park Service trail developments previously described. The section of the John Muir Trail in Yosemite National Park was born and has matured under Ewing’s personal supervision. Mr. Mather’s expedition of 1916 helped to crystallize ideas regarding the Muir Trail and established it in the official minds and master plans of the new National Park Service and the U. S. Forest Service. Robert Sterling Yard, a member of the Mather party and later editor for the new bureau, wrote a sparkling account of the expedition (Yard, 1918). The route at that time was the same within Yosemite National Park as it is today, but the physical condition of the trail has improved mightily. The Mather party traveled the John Muir Trail to Evolution Valley, beyond which the trail was described as impassable to horses. From there the party moved westward to the North Fork of the Kings, then south to the Tehipite Valley, Kanawyers on the South Fork, and yet further southward to the Giant Forest. Today the Giant Forest is more accessible from the John Muir Trail via the High Sierra Trail.