It is a peculiarity of the swallow that you cannot make it afraid of you; just the reverse of other birds. The swallow does not understand being repulsed, but comes back again. Even knocking the nest down will not drive it away, until the stupid process has been repeated several years. The robin must be coaxed; the sparrow is suspicious, and though easy to tame, quick to notice the least alarming movement. The swallow will not be driven away. He has not the slightest fear of man; he flies to his nest close to the window, under the low eave, or on the beams in the out-houses, no matter if you are looking on or not. Bold as the starlings are, they will seldom do this. But in the swallow the instinct of suspicion is reversed, an instinct of confidence occupies its place. In addition to the eave-swallow, to which I have chiefly alluded, and the chimney-swallow, there is the swift, also a roof-bird, and making its nest in the slates of houses in the midst of towns. These three are migrants in the fullest sense, and come to our houses over thousands of miles of land and sea. Robins frequently visit the roof for insects, especially when it is thatched; so do wrens; and the latter, after they have peered along, have a habit of perching at the extreme angle of a gable, or the extreme edge of a corner, and uttering their song. Finches occasionally fly up to the roofs of country-houses if shrubberies are near, also in pursuit of insects; but they are not truly roof-birds. Wagtails perch on roofs; they often have their nests in the ivy, or creepers trained against walls; they are quite at borne, and are frequently seen on the ridges of farmhouses. Tits of several species, particularly the great titmouse and the blue tit, come to thatch for insects, both in summer and winter. In some districts where they are common, it is not unusual to see a goatsucker or fern-owl hawk along close to the eaves in the dusk of the evening for moths. The white owl is a roof-bird (though not often of the house), building inside the roof, and sitting there all day in some shaded corner. They do sometimes take up their residence in the roofs of outhouses attached to dwellings, but not often nowadays, though still residing in the roofs of old castles. Jackdaws, again, are roof-birds, building in the roofs of towers. Bats live in roofs, and hang there wrapped up in their membranous wings till the evening calls them forth. They are residents in the full sense, remaining all the year round, though principally seen in the warmer months; but they are there in the colder, hidden away, and if the temperature rises, will venture out and hawk to and fro in the midst of the winter. Tame pigeons and doves hardly come into this paper, but still it is their habit to use roofs as tree-tops. Rats and mice creep through the crevices of roofs, and in old country-houses hold a sort of nightly carnival, racing to and fro under the roof. Weasels sometimes follow