We were now traversing perhaps the most interesting region in all the North. In the neighbourhood of McMurray there are several tar-wells, so called, and there, if a hole is scraped in the bank, it slowly fills in with tar mingled with sand. This is separated by boiling, and is used, in its native state, for gumming canoes and boats. Farther up are immense towering banks, the tar oozing at every pore, and underlaid by great overlapping dykes of disintegrated limestone, alternating with lofty clay exposures, crowned with poplar, spruce and pine. On the 15th we were still following the right bank, and, anon, past giant clay escarpments along it, everywhere streaked with oozing tar, and smelling like an old ship.

These tar cliffs are here hundreds of feet high, of a bold and impressive grandeur, and crowned with firs which seem dwarfed to the passer-by. The impregnated clay appears to be constantly falling off the almost sheer face of the slate-brown cliffs, in great sheets, which plunge into the river's edge in broken masses. The opposite river bank is much more depressed, and is clothed with dense forest.

The tar, whatever it may be otherwise, is a fuel, and burned in our camp-fires like coal. That this region is stored with a substance of great economic value is beyond all doubt, and, when the hour of development comes, it will, I believe, prove to be one of the wonders of Northern Canada. We were all deeply impressed by this scene of Nature's chemistry, and realized what a vast storehouse of not only hidden but exposed resources we possess in this enormous country. What is unseen can only be conjectured; but what is seen would make any region famous. We now came once more to outcrops of limestone in regular layers, with disintegrated masses overlying them, or sandwiched between their solid courses. A lovely niche, at one point, was scooped out of the rock, over the coping of which poured a thin sheet of water, evidently impregnated with mineral, and staining the rock down which it poured with variegated tints of bronze, beautified by the morning sun.

With characteristic grandeur the bends of the river "shouldered" into each other, giving the expanses the appearance of lakelets; and after a succession of these we came to the first rapid, "The Mountain"—Watchíkwe Powistic—so called from a peak at its head, which towered to a great height above the neighbouring banks. The rapid extends diagonally across the river in a low cascade, with a curve inward towards the left shore. It was decided to unload and make the portage, and a very ticklish one it was. The boats, of course, had to be hauled up stream by the trackers, and grasping their line I got safely over, and was thankful. How the trackers managed to hold on was to me a mystery; but the steep and slippery bank was mere child's play to them. The right bank, from its break and downward, bears a very thick growth of alders, and here we found the wild onion, and a plant resembling spearmint.

In the evening we reached the next rapid, called the Cascades—Nepe Kabátekik—"Where the water falls," and camping there, we had a symposium in our tent, which I could not enjoy, having headache and heartburn, a nasty combination. The 16th was the hottest day of the season—a hard one on the trackers, who now pulled along walls of solid limestone, perpendicular or stepped, or wrought into elaborate cornices, as if by the art of some giant stonecutter. At one place we came to a lovely little rideau, and on the opposite shore were two curious caves, scooped out of the rock, and supported by Egyptian-like columns wrought by the age-action of water.

Towards evening we reached the Crooked Rapid—Kah́wakak o Poẃestik—and here the portage path followed on the summit of the limestone rampart, which the viscous gumbo-slides made almost impassable in rainy weather, and indeed very dangerous, forming, at the time we passed, pits of mud and broken masses of half-hard clay, along the very verge of the wall of rock, likely at any moment to give way and precipitate one into the raging torrent below. At other parts the path was jammed out to the wall-edge, to be stepped round with a gulp in the throat. But these and other features of a like interesting character, though a lively experience to the tenderfoot, were of no account whatever to those wonderful trackers. At one of the worst spots I was hesitating as to how and where I should step next, when a carrier, returning for his load, seeing my fix, humped his back with a laugh and gave me a lift over.

We camped for the night below a point where the river makes a sharp bend, parallel with its course. This we surmounted in the morning, following a rounded wall of limestone, for all the world like a decayed rampart of some ancient city. A wide floor of rock at its base made beautiful walking to a place where the lofty escarpment showed exposures of limestone underlying an enormous mass of dark sandstone, topped by tar-clay. It is a portentous cliff, bearing a curiously Eastern look, as if some great pyramid had been riven vertically, and the exposed surface scarred and scooped by the weather into a multitude of antic hollows, grotesque projections, and unimaginable shapes. Here, also, the knives of passers-by had carved numerous autographs, marring the majestic cliff with their ludicrous incongruity. Are we not all sinners in this way? "John Jones," cut into a fantastic buttress which would fittingly adorn a wizard's temple, may be a poor exhibit of human vanity; but, after all, the real John Jones is more imperishable than the rock, which seems scaling, anyway, from the top, and may, by and by, carry the inscriptions with it. It was hard to tear one's self away from such a wonderful structure as this, the most striking feature of its kind on the whole river.

Farther on, escarped banks, consisting of boulders and pebbles imbedded in tenacious clay, rose to a great height, their tops clothed with rich moss, and wooded with a close growth of pine, the hollows being full of delicious raspberries, now dead ripe.

By and by we encountered the Long Rapids—Kaúkinwauk Powestik—and, some hours afterwards, entered the Middle Rapid—Tuwáo Powestik—the worst we had yet come to, full of boulders and sharp rocks, with a strong current. Very dexterous management was required here on the part of steersman and bowman; a snapt line or a moment's neglect, and a swing to broadside would have followed, and spelled ruin.

It was evening before this rapid was surmounted, and all hands, dog-tired with the long day's pull, were glad to camp at the foot of the Boiler Rapid, the next in our ascent, and so called from the wrecking of a scow containing a boiler for one of the Hudson's Bay Company's steamers. It was the most uncomfortable of camps, the night being close, and filled with the small and bloodthirsty Athabasca mosquito, by all odds the most vicious of its kind. This rapid is strewn with boulders which show above water, making it a very "nice" and toilsome thing to steer and track a boat safely over it, but the tracking path itself is stony and firm, a fortunate thing at such a place. There are no exposures of rock at the foot of this rapid; but along its upper part runs a ledge of asphalt-like rock as smooth as a street pavement, with an outer edge as neatly rounded as if done with a chisel. This was the finest bit of tracking path on the river, excepting, perhaps, the great pavement beneath the cliff at the Long Rapids.