During the eighteen years or so following Hearne’s discovery of Coppermine river, considerable knowledge was acquired as to the resources of the more southern portions of the still unexploited north country by the activities of the Canadian fur traders, including the Northwest Company, in North Saskatchewan, Clearwater, Athabaska and Peace river regions,[9] and the resultant extension southward of the trading operations of the Hudson’s Bay Company. MACKENZIE’S TRIPS OF EXPLORATION including the discovery of the great river of the north which still bears his name, were notable events in the history of the north country; momentous events, in fact, in view of the knowledge first obtained through them of the vast natural resources of the great Mackenzie basin. [Illustration: Winter travel—Dinner time.] Mackenzie set out on his first voyage from Chipewyan, at the head of Lake Athabaska (a Northwest Company’s post), June 3, 1789, and proceeded in canoes via Slave river, Great Slave lake, and Mackenzie river as far as Whale island in the estuary of that stream. On July 16, he started on the return trip by the same route, and reached Chipewyan on September 12. On his second trip, in 1792, Mackenzie proceeded from Chipewyan to the summit of the Rockies via Lake Athabaska, Peace river, and its affluents, making his way to the Pacific through the passes of the mountains, and down the streams on the western slope as best he could. David Thomson, an energetic but little known traveller, made a track survey in 1799 of Lesser Slave river, and of the Athabaska from the mouth of the Pembina to Clearwater forks. In 1803 he filled in the gaps between the forks and Athabaska lake, and in 1810 ascended the river and crossed the Rockies by Athabaska pass. SIR JOHN FRANKLIN.