Information on the rendezvous of 1839 has survived through the account of F. A. Wislizenus, a German doctor and political refugee, who accompanied the St. Louis supply train in the interests of curiosity and recreation. In addition to offering a vivid picture of proceedings at the rendezvous, he also comments on the decline of the fur trade in the Rocky Mountains. Wislizenus, Ermatinger of the Hudson’s Bay Company, the Munger-Griffin missionary party, and several hundred Indians left the rendezvous for Fort Hall, going by the Bear River route, which was soon to become a part of the Oregon Trail. As for the trappers, it appears that some of them, yielding to fate, disbanded, but Meek and Newell were among those who went to Fort Hall and later trapped around Brown’s Hole (a valley made by the Green River along the northern base of the Uinta Range). Others were still attracted to Jackson’s Hole, the heart of the prime beaver country. An eminent pioneer of Montana, W. T. Hamilton, got it from “old-timers” that: In the year 1839 a party of forty men started on an expedition up the Snake River. In the party were Ducharme, Louis Anderson, Jim and John Baker, Joe Power, L’Humphrie, and others. They passed Jackson’s Lake, catching many beaver, and crossed the Continental Divide, following down the Upper Yellowstone—Elk—River to the Yellowstone Lake. [Illustration: Skinning beaver in Jackson’s Hole.] This party was attacked by the Blackfeet near the outlet of Yellowstone Lake, suffering a loss of five men. The survivors, while trapping the Park, witnessed “Sulphur Mountain,” the Mud Volcano, Yellowstone Falls at the head of the Canyon, and the pyrotechnic displays of “Fire Hole Basin.”