Mr. John Burroughs, in one of his charming popular essays[10] on the general habits of our birds, refers to their occasional preference, in sites for their nests, of the borders of frequented roadsides, and mentions finding a nest of the Blue Grosbeak among the trees that line one of the main streets and fashionable drives leading out of Washington City, less than half a mile from the boundary. There, he states, this bird, which, according to Audubon’s observations, is shy and recluse, affecting remote marshes and the borders of large ponds of stagnant water, had placed its nest in the lowest twig of the lowest branch of a large sycamore immediately over a great thoroughfare, and so near the ground that a person standing in a cart or sitting on a horse could have reached it with his hand. The nest was composed mainly of fragments of newspaper and stalks of grass, and though so low, was remarkably well concealed by one of the peculiar clusters of twigs and leaves which characterize this tree. The nest contained young when he discovered it, and though the parent birds were much annoyed by his loitering about beneath the tree, they paid but little attention to the stream of vehicles that was constantly passing. It was a source of wonder to him when the birds could have built it, as they are so much shyer when building than at other times. They must have worked mostly in the early morning, when they could have the place all to themselves. The same observer also noticed another pair of Blue Grosbeaks that had built their nest in a graveyard within the city limits. This was placed in a low bush, and the male continued to sing at intervals till the young were ready to fly. The song of this bird he describes as a rapid, intricate warble, like that of the Indigo Bird, though stronger and louder. Indeed, these two birds so much resemble each other in color, form, voice, manner, and general habits, that, were it not for the difference in size,—the Grosbeak being nearly as large again as the Indigo Bird,—he thinks it would be a hard matter to tell them apart. The females of both birds are clad in the same reddish-brown suits, as are also the young during the first season. The nest of this species has also been found built in a tree within the grounds of the Smithsonian Institution, Washington. The only time I ever met with this species was at Carlisle, Penn., in June, 1843. The previous month Professor Baird had found its nest in a low tree, in open ground, and we found these birds still frequenting the same grounds, where we found another nest containing three eggs. It was in a low thorn-tree on the edge of a wood, but standing out in open ground. The nest was about five feet from the ground.