At sunrise, the birds scatter in small bands to pick up on the wing the long continued meal, which lasts till late in the afternoon. Those who have gone too far abroad and must travel back to the roost after sundown shoot across the sky with incredible swiftness lest darkness overtake them. Relying upon their speed of flight to carry them beyond the reach of {95} enemies, they migrate boldly by daylight instead of at night as the timid little vireos and warblers do. During every day the swallows are with us they must consume billions and trillions of blood-sucking insects that would pester other animals beside ourselves. Think of the mosquito bites alone that they prevent! Every one of us is greatly in their debt. Male and female swallows are dressed so nearly alike that you can scarcely tell one from the other. Both twitter merrily but neither really sings. THE PURPLE MARTIN There is a picturesque old inn beside a post road in New Jersey with a five-storied martin house set up on a pole above its quaint swinging sign. For over thirty years a record was kept on the pole showing the dates of the coming and going of the martins in April and September, which did not vary by more than two or three days during all that time. The inn-keeper locked up in his safe every night the registers on which were entered the arrivals and departures of his human guests, but he valued far more the record of his bird visitors which interested everybody who stopped at his inn. {96} One day, while he was away, a man who was painting a fence for him thought he would surprise him by freshening up the old, weather-beaten pole. Alas! He painted over every precious mark. You may be sure the surprise recoiled upon him like a boomerang when the wrathful inn-keeper returned. However, the martins continue to come back to their old home year after year and rear their broods on little heaps of leaves in every room in the house, which is the cheerful fact of the story. These glossy, blue-black iridescent swallows, grayish white underneath, the largest of their graceful tribe, have always been great favourites. Even the Indians in the Southern States used to hang gourds for them to nest in about their camps--a practice continued by the Negroes around their cabins to this day. Strangely enough these birds which nested and slept in hollow trees before the coming of the white men, were among the first to take advantage of his presence. Now, in the Eastern United States, at least, the pampered darlings of luxury positively refuse to live where people do not put up houses for their comfort. In the sparsely settled West, however, they still condescend to live in trees, but only when they must, like the chimney-swifts, who, by the way are no relation. Plenty of people persist in calling them chimney swallows, which is precisely what they are not. Not even the little house wren has adapted itself so quickly to civilised men's homes, as the swift and purple martin.