It might be easy to suggest plausible reasons for the general absence of swallows from a country like that about Chattanooga; but the extraordinary scarcity of hawks, while many persons--not ornithologists--would account it less of a calamity, is more of a puzzle. From Walden's Ridge I saw a single sparrow hawk and a single red-tail; in addition to which I remember three birds whose identity I could not determine. Five hawks in the course of three weeks spent entirely out of doors, in the neighborhood of mountains covered with old forest! Taken by itself, this unexpected showing might have been ascribed to some queer combination of accidents, or to a failure of observation. In fact, I was inclined so to explain it till I noticed that Mr. Brewster had chronicled a similar state of things in what is substantially the same piece of country. Writing of western North Carolina, he says:[3] "The general scarcity--one may almost say absence--of hawks in this region during the breeding season is simply unaccountable. Small birds and mammals, lizards, snakes, and other animals upon which the various species subsist are everywhere numerous, the country is wild and heavily forested, and, in short, all the necessary conditions of environment seem to be fulfilled." Certainly, so far as my ingenuity goes, the mystery is "unaccountable;" but of course, like every other mystery, it would open quickly enough if we could find the key. Turkey vultures were moderately numerous,--much less abundant than in Florida,--and twice I saw a single black vulture, recognizable, almost as far as it could be seen (but I do not mean at a first glance, nor without due precaution against foreshortened effects), by its docked tail. Both are invaluable in their place,--useful, graceful, admirable, and disgusting. The vultures, the martins, and the swifts were the only common aerial birds. The swifts, happily, were everywhere,--jovial souls in a sooty dress,--and had already begun nest-building. I saw them continually pulling up against the twigs of a partially dead tree near my window. In them nature has developed the bird idea to its extreme,--a pair of wings, with just body enough for ballast; like a racing-yacht, built for nothing but to carry sail and avoid resistance. Their flight is a good visual music, as Emerson might have said; but I love also their quick, eager notes, like the sounds of children at play. And while it has nothing to do with Tennessee, I am prompted to mention here a bird of this species that I once saw in northern New Hampshire on the 1st of October,--an extraordinarily late date, if my experience counts for anything. With a friend I had made an ascent of Mount Lafayette (one of the days of a man's life), and as we came near the Profile House, on our return to the valley, there passed overhead a single chimney swift. What he could be doing there at that season was more than either of us could divine. It was impossible to feel any great