Tree Swallow. The Tree Swallow, as is well known, has been persecuted by the English Sparrow until it has entirely abandoned many districts where formerly it abounded. An energetic war on the English Sparrow, and the careful protection of the Swallow domiciles, in a few years would result in a complete change of the situation, so far as this, one of the most beneficial of the Swallow tribe, is concerned. Barn Swallow. The Barn Swallow formerly was abundant throughout the northern states, especially in New England. The tightly built modern barn, however, no longer invites the presence of the Barn Swallow by affording it friendly shelter, and the birds are becoming scarcer and scarcer. To provide openings in modern barns, and to encourage the presence in them of colonies by providing convenient nesting sites are easy and effective methods by which this beautiful species may be greatly increased in numbers. This bird also requires protection from the English Sparrow, which in one foray has been known to kill the young and destroy the eggs of a large colony. Bank Swallow. The well known Bank Swallow, as its name implies, nests in sand-banks in holes of its own digging. Some farmers in the northern states take special pains to protect their colonies of Bank Swallows from the marauding of the prowling cat. Some even take pains to excavate suitable banks on their farms and devote them to the exclusive use of the Swallows. Gravel and sand-banks are so numerous throughout the north, especially in New England, that at trifling expense the number of colonies of Bank Swallows may be vastly increased, to the advantage of every farmer north and south, and to that of every nature lover as well. Cliff Swallow. The curious pouch-shaped mud structures of the Cliff Swallow, attached under eaves or to the face of cliffs, are a sight familiar enough in the northern and western states, but in the cotton states, save Texas alone, they are wanting, the bird that makes them being exclusively a migrant. The English Sparrow persecutes also the Cliff Swallow; hence, in the north, the bird is much less common than formerly. In Germany the presence of Swallows around houses is so much desired that artificial nests made of clay or other material are put up in order to attract birds by saving them the labour of constructing their own domiciles. No doubt our own Cliff Swallows would be quick to respond to a similar offer of ready-made dwellings, rent free, and in this way the range of this extremely useful species might be materially increased. The Cliff Swallow is one of the most indefatigable insect destroyers extant, and every motive of patriotism and humanity should prompt communities among which they live to protect and foster them in every possible way.