These men say there is a communication from its eastern extremity by a chain of lakes with a shallow river which discharges its waters into the sea.

This stream they call the Thloueetessy, and report it to be navigable for Indian canoes only.

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 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 Begholodessy or River of the Toothless Fish.