One enchanting day--the twenty-fourth of June--was spent in making a trip, with butterfly-net and field-glass, to Green Lake, an emerald gem set in the mountains at an altitude of ten thousand feet, a few miles from Georgetown. Before leaving the town, our first gray-headed junco for this expedition was seen. He had come to town for his breakfast, and was flitting about on the lawns and in the trees bordering the street, helping himself to such dainties as pleased his palate. It may be said here that the gray-headed juncos were observed at various places all along the way from Georgetown to Green Lake and far above that body of water. Not so with the broad-tailed hummers, which were not seen above about eight thousand five hundred feet, while the last warbling vireo of the day was seen and heard at an altitude of nine thousand feet, possibly a little more, when he decided that the air was as rare as was good for his health. A short distance up the cañon of the west branch of Clear Creek, a new kind of flycatcher was first heard, and presently seen with my glass. He sat on a cliff or flitted from rock to bush. He uttered a sharp call, "Cheep, cheep, cheep"; his under parts were bright yellow, his upper parts yellow-olive, growing darker on the crown, and afterwards a nearer view revealed dark or dusky wings, yellowish or gray wing-bars, and yellow eye-rings. He was the western flycatcher, and bears close likeness to our eastern yellow-breasted species. Subsequently he was quite frequently met with, but never far above the altitude of Georgetown. In the same cañon a beautiful Macgillivray's warbler was observed, and two water-ousels went dashing up the meandering stream, keeping close to the seething and roaring waters, but never stopping to sing or bid us the time of day. Very few ousels were observed in our rambles in this region, and no nests rewarded my search, whereas in the vicinity of Colorado Springs, as the reader will recall, these interesting birds were quite frequently near at hand. A mother robin holding a worm in her bill sped down the gulch with the swiftness of an arrow. We soon reached a belt of quaking asps where there were few birds. This was succeeded by a zone of pines. The green-tailed towhees did not accompany us farther in our climb than to an elevation of about nine thousand three hundred feet, but the siskins were chirping and cavorting about and above us all the way, many of them evidently having nests in the tops of the tall pines on the dizzy cliffs. Likewise the hermit thrushes were seen in suitable localities by the way, and also at the highest point we reached that day, an elevation of perhaps ten thousand five hundred feet.