Of this bird both Wilson and Audubon confessed their comparative ignorance, neither ever having seen its nest or become acquainted with its haunts and general habits. Its song is quite striking and novel, though its voice at once suggests the class of Warblers, to which it belongs. It is very shy and wary, flying but a few feet at a time, and studiously concealing itself from your view. I discover but one pair here. The female has food in her beak, but carefully avoids betraying the locality of her nest. The Ground-Warblers all have one notable feature,--very beautiful legs, as white and delicate as if they had always worn silk stockings and satin slippers. High tree Warblers have dark brown or black legs and more brilliant plumage, but less musical ability. The Chestnut-Sided belongs to the latter class. He is quite common in these woods, as in all the woods about. He is one of the rarest and handsomest of the Warblers; his white breast and throat, chestnut sides, and yellow crown show conspicuously. Audubon did not know his haunts, and had never seen his nest or known any naturalist who had. Last year I found the nest of one in an uplying beech-wood, in a low bush near the roadside, where cows passed and browsed daily. Things went on smoothly till the Cow-Bunting stole her egg into it, when other mishaps followed, and the nest was soon empty. A characteristic attitude of the male during this season is a slight drooping of the wings, and tail a little elevated, which gives him a very smart, bantam-like appearance. His song is fine and hurried, and not much of itself, but has its place in the general chorus. A far sweeter strain, falling on the ear with the true sylvan cadence, is that of the Black-throated Green-backed Warbler, whom I meet at various points. He has no superiors among the true _Sylvia_. His song is very plain and simple, but remarkably pure and tender, and might be indicated by straight lines, thus, ---- ----\/----; the first two marks representing two sweet, silvery notes, in the same pitch of voice, and quite unaccented; the latter marks, the concluding notes, wherein the tone and inflection are changed. The throat and breast of the male are a rich black, like velvet, his face yellow, and his back a yellowish green.