And this is strange. The passion for exploration is born in all hearts. We are prompted to go to Tibet, or seek the sources of the Nile, or penetrate the jungles that lie between the Amazon and the Orinoco. I have felt this impulse strongly myself, and longing for distant lands have passed unnoticed this opportunity right at hand for penetrating an untrodden wilderness. With most of us the undiscovered country lies just a step off the beaten track. So across the rolling bog and into the twilight greenness beneath the cedars I sailed to-day, venturing as Columbus did over a known sea to an unknown, and thence to a new world,—one where straight, limbless cedar trunks stand close like temple columns under a gray-green roof of twigs and leaves.

All the upper tones are gray and green, for this is the world of the mosses and lichens. The ground is built of them, and the temple columns are so covered with their arabesques and bas-reliefs, so daintily frescoed and carved, that it seems as if here were a museum of all designs for the beautifying of interiors that ever occurred. And as all the tree trunks are gray and green till the texture and color of bark is hardly to be discerned, so the carpeting of the floor of this temple and the upholstering of its furniture is brown and green. The thin rays of the sun that filter through here and there are greenish gold, till the whole gives an under-water atmosphere to the place, and you walk about as a diver might on the sea-bottom, with things new and strange floating at every hand.

Mosses in the ordinary woodland we are apt to pass with unseeing eye. They decorate rocks and trees, dead stumps and earth with such unobtrusive good taste that we come back feeling the beauty of the woodland, and not at all knowing what made it. Some fence corner or group of trees or shrubs or a stump has touched us with its beauty, and so well dressed it is in its moss clothes that we have not seen them at all, but have come away only with the recollection of how well the rock or the stump looked, and we cannot say whether it wore a plaid or a check or just plain goods.

In this swamp, however, it is as if the whole woodland wardrobe were hung up for inspection, an Easter opening of all kinds of wood wear. Here the Usnea barbata trails its old man’s beard from the cedar limbs well up in the arches above the pillars, its drooping softness having the effect of delicate tapestry. Clinging lichens, those delicate unions of algal cells and fond fungi, paint the northerly sides of the tree trunks all the way down, while the freer-growing fringe or fleck the southern exposures. Parmelias to north, cetrarias and stictas to the south might well guide the wanderer, giving him the points of the compass and leading him thus to his path again.

Under foot the sphagnums build the bog and hold chief sway, but other common varieties dispute the footing with them. Here is the acutifolia with its pointed leaves giving the tufts the appearance of a bunch of pointed petaled chrysanthemums, the greens and purples softly shading into one another and showing a fine contrast with the drier, yellower portions of the plant. Here, too, is the edelweiss-like squarrosum in its loosely-crowded clusters of bluish green, and the robust cymbifolium.

All these grow from their own débris in the wettest portions of the footing. Wherever there is, in this many-colored and lovely carpet, a dead cedar trunk the dainty cedar moss, creeping everywhere, has occupied the space with its delicate fern-like leaves, making of all ugly rotten wood the loveliest furnishing imaginable for these solemn, twilight spaces. Cushion mosses pad with their bluish-green velvet hassocks here and there, and, sitting on one of them that I might put all my wit into seeing, I noted for the first time, though growing all about me, in fact, a moss that I had never seen before,—the mnium.

Its delicate, translucent green leaves are little like those of a moss at first sight. One thinks it rather some rare and delicate flowering plant of the wet bog, now but thrusting up its delicate leaves, to bloom later. I dare say the mnium punctatum is a common bog moss. Very likely I have trampled it ruthlessly under foot before this in following some more showy denizen of the deep woods; but to find it thus, exploring a new swamp for the first time, it gave me as great pleasure as I might have had in finding a new orchid hiding about the sources of the Orinoco.

It was the sphagnums that led me to the brookside and caused me to recall that lusty scientist, Mr. Pickwick, and his discovery of the sources of the Hampstead ponds. And while I stood and wondered I saw a second brook, only a little further on, also flowing downward into the sphagnum and losing itself in the bog, to pass beneath the cedar roots and moss débris and enter the pond.

Some ancient traveler, perhaps Marco Polo, passing from Babylon to Bagdad, coming first upon the Euphrates and then the Tigris, may have felt some of the amazement and delight which I had in this discovery. Never before had I known of a brook entering the pond. It had always been a sheet of water self-contained and sufficient in itself, fed, I thought, by springs beneath its own surface. I had paddled by and tramped over the mouths of these two brooks a hundred times and never knew before why the pond always smiled and dimpled as I went by. No wonder it laughs; it has kept that same joke on ninety-nine of a hundred of the people who frequent it, and I am not sure there is another hundredth.

It seemed as if all the woodland burst into guffaws of laughter, now that the joke was out and there was no further need of keeping quiet about it. The cedars rocked in the west wind with suppressed merriment and a couple of red squirrels snickered like school children and tore up and down the lichen-covered trunks and fell off into a swamp birch and had hardly strength to hold on, so breathless were they. A pair of crows, looking up nesting material, haw-hawed right out over my head till they had to stop flapping and sail, they were so weak from it, and a whole flock of chickadees tittered all along behind my back for a quarter of a mile as I went on up the swamp on the left bank of the Euphrates.