Dead pines cover the ground between Lake Polyganum and the Namakagun. A great fire appears to have raged here formerly, destroying thousands of acres of the most thrifty and tall pines. Nobody can estimate the extent of this destruction. The plain is now grown up with poplar, hazle-bush, scrub-oak, and whortleberry. The river, where the portage strikes it, is about seventy-five feet wide, and shallow, the deepest parts not exceeding eighteen inches. It is bordered on the opposite side with large pines, hardwood, and spruce. Observed amygdaloid under foot among the granite, and sandstone boulders.

About one o'clock the baggage and canoes had all come up, and we embarked on the waters of the Namakagun. Rapids soon obstructed our descent. At these it was necessary for the men to get out and lift the canoes. It was soon necessary for us to get out ourselves and walk in the bed of the stream. It was at last found necessary to throw overboard the kegs of pork, &c., and let them float down. This they would not do without men to guide them and roll them along in bad places. Some of the bags from the canoes were next obliged to be put on men's shoulders to be carried down stream over the worst shallows. After proceeding in this way probably six or seven miles, we encamped at half-past seven o'clock. Mr. Johnston, with his canoe, did not come up. We fired guns to apprize him of our place of encampment, but received no reply. There had been partial showers during the day, and the weather was dark and gloomy. It rained hard during the night. Our canoes were badly injured, the bark peeling off the bows and bottoms. The men had not yet had time to recover from their bruises on the great Wannegum portage. Mr. Clary had shot some ducks and pigeons, on which, at his invitation, we made our evening repast, with coffee, an article which he had among his stores. Some of the men had also caught trout--this fish being abundant here, though it never descends into the Mississippi.

On the next morning I sent a small canoe (Clary's) to aid Johnston. Found him with his canoe broke. Brought down part of his loading, and dispatched the canoe back again. By eleven o'clock the canoe returned on her second trip. Finding the difficulties so great, put six kegs of pork, seven bags of flour, one keg of salt, &c., in depot. One of the greatest embarrassments in passing among such impoverished tribes is the necessity of taking along extra provisions to meet the various bands and to pay for their contingent services.

PUCKWAÉWA VILLAGE.---At four o'clock we had got everything down the shallows, mended our canoe, and reached the Pukwaéwa--a noted Indian village, where we encamped. The distance is about nine miles from the western terminus of the portage, course W.S.W. We found it completely deserted, according to the custom of the Indians, who after planting their gardens, leave them to go on their summer hunts, eating berries, &c. We found eight large permanent bark lodges, with fields of corn, potatoes, pumpkins, and beans, in fine condition. The lodges were carefully closed, and the grounds and paths around cleanly swept, giving the premises a neat air. The corn fields were partially or lightly fenced. The corn was in tassel. The pumpkins partly grown, the beans fit for boiling. The whole appearance of thrift and industry was pleasing.

I sent two canoes immediately up stream, to bring down the stores put in deposit. I arranged things for taking a canoe elège on the next day, and proceeding rapidly down the river to its junction with the main St. Croix and Yellow River, in order to meet my engagements, made by a runner from La Pointe. I took along Dr. Houghton and Mr. Johnston, leaving the heavy baggage in charge of Mr. Woolsey, with directions to accompany Lieut. Clary across the portage from the Namakagun to Ottowa Lake. It was half-past five on the morning of the 29th, when, bidding adieu to Lieut. Clary and Mr. Woolsey, we embarked.

A NEW SPECIES OF NATIVE FRUIT.--In coming down the Namakagun, we found a species of the currant on its banks--the albinervum. It was fully ripe, and of delicious taste.

Incidents on the Namakagun, its Birds, Plants, &c.--About ten o'clock we entered and passed an expansion, having deserted Indian lodges, and a high wooden cross on the south bank. Hence we called it the Lake of the Cross. It is called Pukwaéwa by the Indians. A little below we met the chief Pukquamoo, and his band, returning to the upper village. Held a conference with him on the water on the subject of my mission and movements. He appeared, not only by his village, which we had inspected, but by his words, eminently pacific. On parting he reciprocated my presents by some dried whortleberries. At this conference with the Red-headed Woodpecker chief, I requested him to go up and aid Mr. Woolsey in bringing down the baggage and provisions, and wrote to Mr. Woolsey accordingly.

About four o'clock the chief of this party hailed us from shore, having headed us by taking a short land route from the Lake of the Cross. He sought more perfect information on some points, which was given, and he was requested to attend the general council appointed to be held at Lac Courtorielle (Ottawa Lake). We continued the descent till eight o'clock P.M., having descended about thirty-five miles.

On the 30th we embarked at five in the morning, and reached the contemplated portage to Ottawa Lake at seven. I stopped, and having written notes for Lieut. Clary and Mr. Woolsey, put them in the end of a split pole, according to the Indian method. At ten I landed for breakfast with my canoe badly broken, and the corn, &c., wetted. Detained till twelve. Near night met a band of Chippewas ascending. Got a canoe from them to proceed to Yellow River, and, after dividing the baggage and provisions, put Mr. Johnston with two men in it. This facilitated our descent, as we had found frequent shallows, in consequence of low water, to impede our progress. Yet our estimate for the day's travel is forty miles.

The cicuta is a frequent plant on this river; we found the fox grape this afternoon nearly ripe. Both banks of the river are literally covered with the ripe whortleberry--it is large and delicious. The Indians feast on it. Thousands on thousands of bushels of this fruit could be gathered with little labor. It is seen in the dried state at every lodge. All the careful Indian housewives dry it. It is used as a seasoning to soups.