The village of Georgetown nestles in a deep pocket of the mountains. The valley is quite narrow, and on three sides, save where the two branches of Clear Creek have hewn out their cañons, the ridges rise at a sharp angle to a towering height, while here and there a white-cap peeps out through the depressions. Those parts of the narrow vale that are irrigated by the creek and its numerous tiny tributaries are beautiful in their garb of green, while the areas that are not thus refreshed are as gray as the arid portions of the plains themselves. And that is the case everywhere among the Rockies--where no water flows over the surface the porous, sandy soil is dry and parched. The altitude of Georgetown is eight thousand four hundred and seventy-six feet. We were therefore three thousand feet higher than we had been in the morning, and had a right to expect a somewhat different avi-fauna, an expectation in which we were not disappointed. Our initial ramble took us down the valley. The first bird noted was a familiar one--the warbling vireo, which is very abundant in Colorado in its favorite localities, where all day you may be lulled by its "silvery converse, just begun and never ended." No description of a bird so well known in both the East and the West is required, but the one seen that day gave a new performance, which seems to be worthy of more than a passing notice. Have other bird students observed it? The bird was first seen flitting about in the trees bordering the street; then it flew to its little pendent nest in the twigs. I turned my glass upon it, and, behold, there it sat in its tiny hammock singing its mercurial tune at the top of its voice. It continued its solo during the few minutes I stopped to watch it, glancing over the rim of its nest at its auditor with a pert gleam in its twinkling eyes. That was the first and only time I have ever seen a bird indulging its lyrical whim while it sat on its nest. Whether the bird was a male or a female I could not determine, but, whatever its sex, its little bosom was bubbling over with music.[11] [11] After the foregoing was written, I chanced upon the following note in "Bird Lore" for September and October, 1901, written by a lady at Moline, Illinois, who had made an early morning visit to the haunt of a warbling vireo: "Seated on the ground, in a convenient place for watching the vireo, which was on the nest, we were soon attracted by a vireo's song. Search for the singer failed to find it, until we noted that the bird on the nest seemed to be singing. Then, as we watched, over and over again the bird was seen to lift up its head and pour out the long, rich warble--a most delicious sight and sound. Are such ways usual among birds, or did we chance to see and hear an unusual thing?"