Green River Valley is an elevated region, from six thousand to seven thousand feet above sea. It stretches from the Wind River Mountains on the north to the Uintas on the south, and is bounded westwardly by the Wyoming Range, and on the east merges into the Laramie Plains. The drainage exit is through the Uintas, as noted, by means of the canyons heading at Flaming Gorge. There are here opportunities for extensive farming by irrigation. The only other chance for agriculture on the river, except Wonsits Valley, Brown’s Park, and a few minor places, is below Black Canyon, in the stretches I have called the alluvial and the canyon-valley divisions. In the latter short canyons separate extensive valleys with wide alluvial bottoms capable of high cultivation, though often subject to overflow. Almost anything will grow there. Vast groves of cottonwood and mesquite exist. In the alluvial division, the last stretch of the river, from the Gila down, cotton and sugar cane would probably grow. This is the only division where the water of the river can be extensively diverted. At the mouth of the Gila an old emigrant road to California crossed, and another here in this Green River Valley. A third route of travel was by way of Gunnison’s Crossing; and a fourth, though this was seldom traversed, was by the Crossing of the Fathers, some thirty-five miles above the present Lee’s Ferry. In Green River Valley, Bonneville built his Fort Nonsense, and the region was for many years the best known of any place beyond the mountains. The routes of trappers and prospectors frequently followed aid native trails, which crossed and recrossed the country in every direction, except where the canyons of the Green and Colorado were approached, when few lines of traverse were open across, and none along the course of the water. The Joshua Tree. The Joshua Tree. Clistoyucca Arborescens. Southern Nevada. Photograph by C.R. SAVAGE. On the headwaters of Green River lived the Crows, who called it the Seedskedee Agie or Prairie Hen River. The Snakes and Utes living farther down called it the Bitter-root. Frémont called it the Rio Verde of the Spaniards, but apparently without good authority. It was also spoken of as Spanish River, from the report that Spaniards occupied its lower valleys. Colorado was also one of its names, and this is what it should have remained. The commonest appellation was Green, supposed to have been derived from a trapper of that name. Just when the term “Colorado” was first applied to the lower river is not now known. It bore several names, but finally Colorado took first place because of its appropriateness. Both the walls and the water are usually red, though the name is undoubtedly derived from the colour of the water. Green River is frequently as red as any river could be. After a storm in the headwaters of Vermilion Creek I have seen the Green a positively bright vermilion.