My spirits infallibly rise in proportion to the outward dreariness. Give me the ocean, the desert or the wilderness! In the desert, pure air and solitude compensate for want of moisture and fertility. The traveller Burton says of it--"Your _morale_ improves; you become frank and cordial, hospitable and single-minded.... In the desert, spirituous liquors excite only disgust. There is a keen enjoyment in a mere animal existence." They who have been travelling long on the steppes of Tartary say--"On re-entering cultivated lands, the agitation, perplexity, and turmoil of civilisation oppressed and suffocated us; the air seemed to fail us, and we felt every moment as if about to die of asphyxia." When I would recreate myself, I seek the darkest wood, the thickest and most interminable, and, to the citizen, most dismal swamp. I enter a swamp as a sacred place,--_a sanctum sanctorum_. There is the strength, the marrow of Nature. The wild-wood covers the virgin mould,--and the same soil is good for men and for trees. A man's health requires as many acres of meadow to his prospect as his farm does loads of muck. There are the strong meats on which he feeds. A town is saved, not more by the righteous men in it than by the woods and swamps that surround it. A township where one primitive forest waves above while another primitive forest rots below,--such a town is fitted to raise not only corn and potatoes, but poets and philosophers for the coming ages. In such a soil grew Homer and Confucius and the rest, and out of such a wilderness comes the Reformer eating locusts and wild honey. To preserve wild animals implies generally the creation of a forest for them to dwell in or resort to. So it is with man. A hundred years ago they sold bark in our streets peeled from our own woods. In the very aspect of those primitive and rugged trees there was, methinks, a tanning principle which hardened and consolidated the fibres of men's thoughts. Ah! already I shudder for these comparatively degenerate days of my native village, when you cannot collect a load of bark of good thickness; and we no longer produce tar and turpentine. The civilised nations--Greece, Rome, England--have been sustained by the primitive forests which anciently rotted where they stand. They survive as long as the soil is not exhausted. Alas for human culture! little is to be expected of a nation when the vegetable mould is exhausted, and it is compelled to make manure of the bones of its fathers. There the poet sustains himself merely by his own superfluous fat, and the philosopher comes down on his marrow-bones.