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OW curious is the structure of the nest of the Bullfinch or Chaffinch! The inside of it is lined with cotton and fine silken threads; and the outside cannot be sufficiently admired, though it is composed only of various kinds of fine moss. The color of these mosses, resembling that of the bark of the tree in which the nest is built, proves that the bird intended it should not be easily discovered. In some nests, hair, wool, and rushes are cleverly interwoven. In others, the parts are firmly fastened by a thread, which the bird makes of hemp, wool, hair, or, more commonly, of spiders' webs. Other birds—as, for instance, the blackbird and the lapwing—after they have constructed their nests, plaster the inside with mortar; they then stick upon it, while quite wet, some wool or moss to give warmth; but all alike construct their nests so as to add to their security.