The sparrow is not a beautiful bird except in our affections and associations, and its eggs are not beautiful as eggs go,—four or five little freckled spheres, that, like the bird itself, blend well with the ground upon which they are placed. The eggs of the "chippie," or social sparrow, are probably the most beautiful of sparrow eggs, being of a bright bluish green with a ring of dark purple spots around the larger end. Generally there is but little relation between the color of the bird and the color of its egg. For the most part, the eggs of birds that occupy open, exposed nests are of some tint that harmonizes well with the surroundings. With the addition of specks of various hue, they are rendered still less conspicuous. The eggs of the scarlet tanager are greenish blue, with faint brown or purplish markings. The blackbird lays a greenish blue egg also, with various markings. Indeed, the favorite ground tint of the birds that build open nests is a greenish blue; sometimes the blue predominates, sometimes the green; while the eggs of birds that build concealed nests, or lay in dark cavities, are generally white, as is the case with the eggs of all our woodpeckers, for instance. The eggs of the bluebird are bluish white. Among the flycatchers, the nest of the phœbe is most concealed, at least from above, and her eggs are white, while those of nearly all the other species are more or less tinted and marked. The eggs of the hummingbird are white, but the diminutiveness of their receptacle is a sufficient concealment. Another white egg is that of the kingfisher, deposited upon fish-bones at the end of a hole in the bank eight or nine feet long. The bank swallow also lays white eggs, as does the chimney swallow, the white-bellied swallow, and the purple martin. The eggs of the barn swallow and cliff swallow are more or less speckled. In England the kingfisher (smaller and much more brilliantly colored than ours), woodpeckers, the bank swallow, the swift, the wryneck (related to the woodpecker), and the dipper also lay white eggs.