The northern end of the American continent is a region of mountains, lakes, and rivers. Several expeditions have been undertaken through it,--the first to ascertain the coast-line, by Mackenzie, Franklin, Richardson, Back, and others, and latterly by Dr Rae; and also by Sir John Richardson, who left the comforts of England to convey assistance to his long-missing former companions, though unhappily without avail. These journeys, through vast barren districts, among rugged hills, marshes, lakes, and rivers, in the severest of climates, exhibit in the explorers an amount of courage, endurance, and perseverance never surpassed. In the course of the rivers occur many dangerous falls, rapids, and cataracts, amid rocks and huge boulders, between which the voyagers' frail barks make their way, running a fearful risk every instant of being dashed to pieces. Not a tree rears its head in the wild and savage landscape, the vegetation consisting chiefly of lichens and mosses. Among the former the tripe de roche is the most capable of supporting life. Here winter reigns with stern rigour for ten months in the year; and even in summer biting blasts, hail-storms, and rain frequently occur. Yet in this inhospitable region numerous herds of reindeer, musk-oxen, and other mammalia find subsistence during the brief summer, as do partridge and numerous birds of various species. Here the Esquimaux lives in his skin-tent during the warmer months, and in his snow-hut in winter, existing on the seals which he catches with his harpoon, the whales occasionally cast on shore, and the bears, deer, and smaller animals he entraps. The numerous rivers flowing from the mountain-ridges mostly make their way northward. The Mackenzie, the largest and most western, rising in the Great Slave and Great Bear Lakes, falls, after a course of many hundred miles, into the Polar Sea. The Coppermine River, rising in Point Lake, makes its course in the same direction; while eastward, the great Fish or Back River, flowing from the same lake as the first mentioned stream, reaches the ocean many hundred miles away from it, at the lower extremity of Bathurst Islet. It runs rapidly in a tortuous course of 530 geographical miles through an iron-ribbed country, without a single tree on the whole line of its banks, expanding here and there into five large lakes, and broken by thirty-three falls, cascades, and rapids ere it reaches the Polar Sea. Not far from its mouth rises the barren rocky height of Cape Beaufort.