It was upon the 17th of May, 1673, that the two explorers, in high spirits, set forth from Marquette's little mission at Point Ignace. Five French boatmen paddled their two canoes, and did most of the heavy work of the journey, carrying the boats and cargoes around rapids, or along portage trails from one river to another. Marquette says in his journal: "Our joy at being chosen for this expedition roused our courage, and sweetened the labor of paddling from morning to night."

The course they took was, no doubt, that followed through nearly two hundred years thereafter by persons journeying in canoes from Mackinac to Green Bay. They paddled along the northern shores of Lake Michigan and Green Bay, until they could cross over through the stormy water known as "Death's Door," to the islands beyond the Door county peninsula; and then crept down the east shore of Green Bay, under the lee of the high banks.

They seem to have made good time, for on the 7th of June they reached the village of the Mascoutins, on the south shore of Fox River, near where Berlin now is, the same village, it will be remembered, where Nicolet, Radisson, and Allouez had already been entertained. We do not know upon what day our two explorers had reached De Pere, where the Jesuit mission was established, but they probably stayed among their friends there for some days, before going up the Fox.

In his journal, the good missionary described nearly everything he saw, with much detail. The Menominee Indians interested him greatly; he calls them "the People of the Wild Oats," and tells how they gather the grain of these wild oats (or wild rice), by "shaking the ears, on their right and left, into the canoe as they advance" through the swamps. Then they take the grain to the land, strip it of much of the chaff, and "dry it in the smoke on a wooden lattice, under which they keep up a small fire for several days. When the oats are well dried, they put them in a skin of the form of a bag, which is then forced into a hole made on purpose in the ground; then they tread it out, so long and so well, that the grain being freed from the chaff is easily winnowed; after which they reduce it to meal." There are still to be seen, on the shores of Lake Koshkonong, and several other Wisconsin lakes and rivers, the shallow, bowl-like holes used by the Indians in threshing this grain, as described by Marquette two and a quarter centuries ago.

The Mascoutin village also claims much attention in the missionary's diary. The Mascoutins themselves are rude, he says; so also are the Kickapoos, many of whom live with them. At this village are also many Miami Indians, who had fled from their homes in Indiana and Ohio, through fear of the fierce Iroquois of New York. These Miamis are, Marquette tells us, superior to the Wisconsin Indians, being "more civil, liberal, and better made; they wear two long earlocks, which give them a good appearance," and are brave, docile, and devout, listening carefully to the missionaries who have visited them. The Father also describes the site of the village: "I felt no little pleasure in beholding the position of this town; the view is beautiful and very picturesque, for from the eminence on which it is perched, the eye discovers on every side prairies spreading away beyond its reach, interspersed with thickets or groves of lofty trees. The soil is very good, producing much corn; the Indians gather also quantities of plums and grapes, from which good wine could be made, if they chose. As bark for cabins is rare in this country, they use rushes, which serve them for walls and roof, but which are no great shelter against the wind, and still less against the rain when it falls in torrents. The advantage of this kind of cabins is that they can roll them up, and carry them easily where they like in hunting-time."

Above the Mascoutin village, the Fox begins to narrow, being hemmed in, and often choked, by broad swamps of reeds and wild oats. The canoe traveler who does not know the channel, is sometimes in danger of missing it, and getting entangled in the maze of bayous. Two Miami guides were therefore obtained from their hosts, and on the 10th of June the travelers set off for the southwest, "in the sight of a great crowd, who could not wonder enough to see seven Frenchmen alone in two canoes, dare to undertake so strange and so hazardous an expedition." The guides safely conducted them to the place where is now situated the city of Portage, helped them over the swampy plain of a mile and a half in width, and, after seeing them embarked upon the broad waters of the Wisconsin River, left them "alone in an unknown country, in the hands of Providence."

The broad valley of the Wisconsin presents a far different appearance from that of the peacefully flowing Upper Fox, with its outlying marshes of reeds, and its numerous lakes. The Wisconsin, or Meskousing, as Marquette writes it, is flanked by ranges of bold, heavily wooded bluffs, which are furrowed with romantic ravines, while the channel is, at low water, studded with islands and sand bars, and in times of flood spreads to a great width. Marquette himself describes it thus: "It is very broad, with a sandy bottom, forming many shallows, which render navigation very difficult. It is full of vine-clad islets. On the banks appear fertile lands diversified with wood, prairie, and hill. Here you find oaks, walnut, whitewood, and another kind of tree with branches armed with long thorns. We saw no small game or fish, but deer and moose in considerable numbers." About ninety miles below Portage, they thought that they discovered an iron mine.

At last, on the 17th of June, they swiftly glided through the picturesque delta of the Wisconsin, near Prairie du Chien, and found themselves upon the Mississippi, grateful that after so long and tiresome a journey they had found the object of their search. Joliet's instructions were, however, to ascertain whether the great stream flowed into the "Southern Sea"; so they journeyed as far down as the mouth of the Arkansas. There they gathered information from the Indians which led them to believe that the river emptied into the Gulf of Mexico; thus the old riddle of the supposed waterway through the heart of the North American continent was left unsolved.