The forms of the south and western shores are better known from the survey of Sir Alexander Mackenzie, and in consequence of the canoes having to pass and repass along these borders annually, between Moose-Deer Island and Mackenzie's River.

Our observations made the breadth of the lake, between Stony Island, and the north main shore, sixty miles less than it is laid down in Arrowsmith's map; and there is also a considerable difference in the longitude of the eastern side of the bay, which we entered.
This lake, owing to its great depth, is seldom completely frozen over before the last week in November, and the ice, which is generally seven feet thick, breaks up about the middle of June, three weeks later than that of the Slave River.

The only known outlet to this vast body of water, which receives so many streams on its north and south shores, is the Mackenzie's River.
_August 3_ .-- We embarked at three A.M.and proceeded to the entrance of the Yellow-Knife River of the traders, which is called by the natives Beg-ho-lo-dessy; or, River of the Toothless Fish.

We found Akaitcho, and the hunters with their families, encamped here.

There were also several other Indians of his tribe, who intended to accompany us some distance into the interior.