Except the Indians themselves, whose wood-craft he never tires of celebrating, few Americans were ever more at home in the open air than Thoreau; not even his friend John Brown, who, like himself, suggested the Indian by the delicacy of his perceptions and his familiarity with all that goes forward, or stands still, in wood and field. Thoreau could find his path in the woods at night, he said, better by his feet than his eyes.

In his last illness says Channing,—

This out-door life began as early as he could recollect, and his special attraction to rivers, woods, and lakes was a thing of his boyhood. He had begun to collect Indian relics before leaving college, and was a diligent student of natural history there. Whether he was naturally an observer or not (which has been denied in a kind of malicious paradox), let his life-work attest. Early in 1847 he made some collections of fishes, turtles, etc., in Concord for Agassiz, then newly arrived in America, and I have (in a letter of May 3, 1847) this account of their reception:—

On the 27th of May, Thoreau's correspondent says:—

June 1st, in other collections, other new species were discovered, much to Agassiz's delight, who never failed afterward to cultivate Thoreau's society when he could. But the poet avoided the man of science, having no love for dissection; though he recognized in Agassiz the qualities that gave him so much distinction.

The paper on "Ktaadn and the Maine Woods," which Horace Greeley bought "at a Jew's bargain," and sold to a publisher for seventy-five dollars, was the journal of a visit made to the highest mountain of Maine during Thoreau's second summer at Walden. An aunt of his had married in Bangor, Maine, and her daughters had again married there, so that the young forester of Concord had kinsmen on the Penobscot, engaged in converting the Maine forests into pine lumber. At the end of August, in 1846, while his Carlyle manuscript was passing from Greeley to Griswold, from Griswold to Graham, and from Graham to the Philadelphia type-setters, Thoreau himself was on his way from Boston to Bangor; and on the first day of September he started with his cousin from Bangor, to explore the upper waters of the Penobscot and climb the summit of Ktaadn. The forest region about this mountain had been explored in 1837 by Dr. Jackson, the State Geologist, a brother-in-law of Mr. Emerson; but no poet before Thoreau had visited these solitudes and described his experiences there. James Russell Lowell did so a few years later, and, early in the century, Hawthorne, Longfellow, and Emerson had tested the solitude of the Maine woods, and written about them. The verses of Emerson, describing his own experiences there (not so well known as they should be), are often thought to imply Thoreau, though they were written before Emerson had known his younger friend, whose after adventures they portray with felicity.

Thus much is a picture of the Maine forests, and may have been suggested in part by the woodland life of Dr. Jackson there while surveying the State. But what follows is the brave proclamation of the poet, for himself and his heroes, among whom Thoreau and John Brown must be counted, since it declares their creed and practice,—while in the last couplet the whole inner doctrine of Transcendentalism is set forth:—

Thoreau may have heard these verses read by their author in his study, before he set forth on his first journey to Maine in 1838; they were first published in the "Dial" in October, 1840, but are omitted, for some reason, in a partial edition of Emerson's Poems (in 1876). He never complied with this description so far as to spend three months in the Maine woods, even in the three campaigns which he made there (in 1846, in 1853, and in 1857), for in none of these did he occupy three weeks, and in all but little more than a month. His account of them, as now published, makes a volume by itself, which his friend Channing edited two years after Thoreau's death, and which contains the fullest record of his studies of the American Indian. It was his purpose to develop these studies into a book concerning the Indian, and for this purpose he made endless readings in the Jesuit Fathers, in books of travel, and in all the available literature of the subject. But the papers he had thus collected were not left in such form that they could be published; and so much of his untiring diligence seems now lost, almost thrown away. Doubtless his friends and editors, upon call, will one day print detached portions of these studies, from entries in his journals, and from his commonplace books.

In his explorations of Concord and its vicinity, as well as in those longer foot-journeys which he took among the mountains and along the sea-shore of New England, from 1838 to 1860, Thoreau's habits were those of an experienced hunter, though he seldom used a gun in his years of manhood. Upon this point he says in "Walden":—

Emerson mentions that Thoreau preferred his spy-glass to his gun to bring the bird nearer to his eye, and says also of his patience in out-door observation:—

And I have thought that Emerson had Thoreau in mind when he described his "Forester":—

The same friend said of him:—

It was this poetic and coÖrdinating vision of the natural world which distinguished Thoreau from the swarm of naturalists, and raised him to the rank of a philosopher even in his tedious daily observations. Channing, no less than Emerson, has observed and noted this trait, giving to his friend the exact title of "poet-naturalist," and also, in his poem, "The Wanderer," bestowing on him the queer name of Idolon, which he thus explains:—

In an earlier poem Channing had called him "Rudolpho," and had thus portrayed his daily and nightly habits of observation:—

The hint here given that Thoreau injured his once robust health by his habits of out-door study and the hardships he imposed on himself, had too much truth in it. Growing up with great strength of body and limb, and having cultivated his physical advantages by a temperate youth much exercised with manual labor, in which he took pleasure, Thoreau could not learn the lesson of moderation in those pursuits to which his nature inclined. He exposed himself in his journeys and night encampments to cold and hunger, and changes of weather, which the strongest cannot brave with impunity. Mr. Edward Hoar, who traveled with him in the Maine woods in 1857,—a journey of three hundred and twenty-five miles with a canoe and an Indian, among the head-waters of the Kennebec, Penobscot, and St. John's rivers,—and who in 1858 visited the White Mountains with him, remembers, with a shiver to this day, the rigor of a night spent on the bare rocks of Mount Washington, with insufficient blankets,—Thoreau sleeping from habit, but himself lying wakeful all night, and gazing at the coldest of full moons. It was after such an experience as this on Monadnoc, whither Thoreau and Channing went to camp out for a week in August, 1860, that the latter wrote:—

Thoreau had much scorn for weakness like this, and said of his comrade, "I fear that he did not improve all the night as he might have done, to sleep." This was his last excursion, and he died within less than two years afterward. The account of it which Channing has given may therefore be read with interest:—

"He ascended such hills as Monadnoc by his own path; would lay down his map on the summit and draw a line to the point he proposed to visit below,—perhaps forty miles away on the landscape, and set off bravely to make the 'shortcut.' The lowland people wondered to see him scaling the heights as if he had lost his way, or at his jumping over their cow-yard fences,—asking if he had fallen from the clouds. In a walk like this he always carried his umbrella; and on this Monadnoc trip, when about a mile from the station (in Troy, N. H.), a torrent of rain came down; without the umbrella his books, blankets, maps, and provisions would all have been spoiled, or the morning lost by delay. On the mountain there being a thick soaking fog, the first object was to camp and make tea.[13] He spent five nights in camp, having built another hut, to get varied views. Flowers, birds, lichens, and the rocks were carefully examined, all parts of the mountain were visited, and as accurate a map as could be made by pocket compass was carefully sketched and drawn out, in the five days spent there,—with notes of the striking aerial phenomena, incidents of travel and natural history. The fatigue, the blazing sun, the face getting broiled, the pint-cup never scoured, shaving unutterable, your stockings dreary, having taken to peat,—not all the books in the world, as Sancho says, could contain the adventures of a week in camping. The wild, free life, the open air, the new and strange sounds by night and day, the odd and bewildering rocks, amid which a person can be lost within a rod of camp; the strange cries of visitors to the summit; the great valley over to Wachusett, with its thunder-storms and battles in the cloud; the farmers' backyards in Jaffrey, where the family cotton can be seen bleaching on the grass, but no trace of the pigmy family; the dry, soft air all night, the lack of dew in the morning; the want of water,—a pint being a good deal,—these, and similar things make up some part of such an excursion."