jealous rivals, as in pouring out their songs of joy; their days are divided between singing and fighting; they eat with haste, exhibiting the greatest excitement in all they do. Each pair seeks a separate spot for its own nest, driving away all other birds, so that breeding settlements, such as we have elsewhere described, are rarely seen amongst them. The nests of the Passeres are of different forms, and exhibit very various degrees of skill in their construction. Sometimes they may be seen hanging from, or placed upon, waving twigs or thick branches; sometimes they are hidden among the foliage, or in holes of trees or fissures of rocks, and they may often be found concealed under bushes, among reeds, corn, grass, and even upon the ground. Their exterior is carefully formed of twigs, grass, hay, lichens, moss, plant-cotton, and such like materials, and is lined with softer fibres, moss, scraps of wool, hair, and feathers. The brood commonly consists of from three to eight eggs of various shape and colour, usually light blue or green, or yellowish grey, with markings of various kinds. In most cases only the female sits upon the eggs, and during the period of incubation she is fed by her mate, but sometimes the two sexes share this duty and sit in turn, appearing to rival each other in taking care of their little family. The young early attain their full growth, and seldom need the attention of the parents after they have left the nest, as they soon learn to seek their own food and associate together in flocks, flying about over a limited extent of country until the season for moulting arrives. The parents meanwhile rear another brood, sitting sometimes thrice in the year, whilst others breed but once in the twelve months. Many enemies pursue these small and feeble creatures--indeed, some falcons feed entirely upon them; those and their nightly pursuers, the owls, must be considered as their most formidable foes, though monkeys, lemurs, cats, weasels, bears, and shrew-mice, the tree-frequenting rodents, and some kinds of snakes, are dangerous enemies; indeed, man himself cannot always be numbered among their friends. On the whole, the damage done by Passerine birds is not very serious, and some of them are inexpressibly useful by reason of the enormous quantities of insects and seeds of noxious plants which they devour; still, there is no denying that many species become very troublesome, especially when they congregate in large flocks, and descend upon ripe corn or fruit-trees, and we readily acknowledge that it cannot be agreeable to have to entertain hundreds of thousands of these little destroyers for weeks together. * * * * *