rior. It took its name from the supposition that it was 40 miles from Fort Reliance, but the true distance is 46 miles. On the south side of the outlet of this stream is the old trading post and modern town of Forty-Mile, and on the north side the more recent settlement Cudahy. Both towns are, of course, on the western bank of the Yukon, which is here about half a mile wide. Five miles below Cudahy, Coal Creek comes in from the east, and nearly marks the Alaskan boundary, where a narrowed part of the river admits one to United States territory. Prominent landmarks here are two great rocks, named by old timers Old Man rock, on the west bank, and Old Woman, on the east bank, in reference to Indian legends attached to them. Some twenty miles west of the boundary-the river now having turned nearly due west in its general course -Seventy-mile, or Klevande Creek, comes in from the south, and somewhat below it the Tat-on-duc from the north. It was ascended in 1887 by Mr. Ogilvie, who describes its lower valley as broad and well timbered, but its upper part flows through a series of magnificent cañons, one of which half a mile long, is not more than 50 feet wide with vertical walls fully 700 feet in height. There are said to be warm sulphur springs along its course, and the Indians regard it as one of the best hunting fields,

sheep being especially numerous on the mountains in which it heads, close by the international boundary, where it is separated by only a narrow divide from Ogilvie River, one of the head streams of the Peel river, and also from the head of the Porcupine, to which there is an Indian trail. Hence the miners call this Sheep River. The rocks along this stream are all sandstones, limestone and conglomerates, with many thin calcite veins. Large and dense timber prevails, and game is abundant.

Below the mouth of the Tat-on-duc several small streams enter, of which the Kandik on the north and the Kolto or Charley's River—at the mouth of which there used to be the home of an old Indian notability named Charley—are most important. About 160 miles from the boundary the Yukon flats are reached, and the center of another important mining district-that of Birch Creek and the Upper Tenana-at Circle City, the usual terminus of the trip up the Lower Yukon from St. Michael.

HISTORY AND CHARACTERISTICS OF THE UPPER YUKON VALLEY.

The sources of the Yukon are just within the northern boundary of British Columbia (Lat. 62 deg.) among a mass of mountains forming a part of the great uplift of the Coast range, continuous with the Sierras of California and the Puget Sound coast. Here spring the sources of the Stikeen, flowing southwest to the Pacific, of the Fraser, flowing south through British Columbia, and of the Liard flowing northeasterly to the Mackenzie. Headwaters of the Stikeen and Liard interlock, indeed, along an extensive or sinuous watershed having an elevation of 3,000 feet or less and extending east and west. There are, however, many wide and comparatively level bottom lands scattered throughout this region and numerous lakes. The coast ranges here have an average width of about eighty miles. and border the continent as far north as Lynn Canal, where they trend inland behind the St. Elias Alps. Many of their peaks exceed 8,000 feet in height, but few districts have been explored west. Eastward of this mountain axis, and separated from it by the valleys of the Fraser and Columbia in the south and the Yukon northward, is the Con

tinental Divide, or Rocky Mountains proper, which is broken through (as noted above) by the Laird, but north of that cañon-bound river forms the watershed between the Liard and Yukon and between the Yukon and Mackenzie. These summits attain a height of 7,000 to 9,000 feet, and rise from a very complicated series of ranges extending northward to the Arctic Ocean, and very little explored. The valley of the Yukon, then, lies between the Rocky Mountains, separating its drainage basin from that of the Mackenzie, and the Coast range and St. Elias Alps separating it from the sea. Granite is the principal rock in both these great lines of watershed-uplift, and all the mountains show the effects of an extensive glaciation, and all the higher peaks still bear local remnants of the ancient Icesheet.

The headwaters of the great river are gathered into three principal streams. First, the Lewes, easternmost, with its large tributaries, the Teslintoo and Big Salmon; second, the Pelly, with its great western tributary, the MacMillon.

It was

The Lewes River has been described. known to the fur traders as early as 1840, and the Chilkat and Chilkoot passes were occasionally used by their Indian couriers from that time on. The gold fields in British Columbia from 1863 onwards