Page:Excursions (1863) Thoreau.djvu/100

92 and was privy to the plan of the universe. So is the least part of nature in its bearings referred to all space. These lesser mountain ranges, as well as the Alleghanies, run from northeast to southwest, and parallel with these mountain streams are the more fluent rivers, answering to the general direction of the coast, the bank of the great ocean stream itself. Even the clouds, with their thin bars, fall into the same direction by preference, and such even is the course of the prevailing winds, and the migration of men and birds. A mountain-chain determines many things for the statesman and philosopher. The improvements of civilization rather creep along its sides than cross its summit. How often is it a barrier to prejudice and fanaticism? In passing over these heights of land, through their thin atmosphere, the follies of the plain are refined and purified; and as many species of plants do not scale their summits, so many species of folly no doubt do not cross the AlleghaniesAlleghenies [sic]; it is only the hardy mountain plant that creeps quite over the ridge, and descends into the valley beyond.

We get a dim notion of the flight of birds, especially of such as fly high in the air, by having ascended a mountain. We can now see what landmarks mountains are to their migrations; how the Catskills and Highlands have hardly sunk to them, when Wachusett and