It was the Banker again, on the other side of the lake, who made the next discovery. We were hunting a little apart through the woods, when he announced from where he stood that he had just caught a glimpse of a Brewster's warbler. For the benefit of other bird-students who are in my class, let me write what I learned that day in regard to said bird. A Brewster's warbler is the rare hybrid between the golden-winged warbler and the blue-winged warbler, more closely resembling the golden-winged. When it takes after the blue-winged, it is called the Lawrence warbler. This specimen we studied feather by feather for over half an hour at short range, and the experts of the party pronounced it beyond peradventure a Brewster's warbler,--a bird not seen often in a lifetime. It was solid blue on the back, pearly white underneath, and showed white tail-feathers, together with a greenish-yellow patch on the very crown of its head. It had two broad yellow wing-bars, one large and the other small, and its white throat, innocent of any black mark, was the field-mark by which it could be told from either of its parents or from its half-brother the Lawrence. It was the Artist who made the last discovery of the day. Near the crest of the mountain, he gave a piercing cry and announced that he had discovered an Indian cobra. We all hastened to his rescue, and saw a fearsome sight. Coiled in front of him, hissed and struck a bloated, swollen snake, with flattened head and up-turned snout. It was none other than the American puff-adder, which ought to be called the bluff adder since, in spite of its threats, it is never known to bite, and is really a harmless and gentle snake. The last thing the writer can remember of that trip was hearing, as he fell asleep, the Architect tell the Banker of the time he found two loon's eggs, which a man had discovered on the top of a muskrat's house and put under one of his hens to hatch. The next day we were back in Philadelphia and summer again, with a list of seventy-six different kinds of birds identified on the trip and a total of ten nests found.