"The flight of the Swift is so rapid that at times it is almost impossible for the quickest eye to follow him; his wings are very strong, and almost as long as all the rest of his body. Short and blunt as his tail looks when he flies, each feather ends in a hard sharp point which sticks out beyond the soft part. They feed on insects which they catch as they dash through the air, and can also break off dry twigs for nest-building without stopping—sometimes seizing the little sticks in their bills and sometimes in their claws, which are much stronger than those of Swallows."
"How do they make the sticks stay in the chimney? What do they set them on, and how do they perch while they are building?" asked Nat, all in one breath.
"Do you remember how the little Brown Creeper propped himself against the tree when he looked for insects?"
"Yes," said Rap; "he stuck his sharp tail-feathers into the bark and made a bracket of himself."
"The Swift does this also when he fastens twigs together for a nest. They are glued together into a little openwork basket, and gummed to the wall of the chimney, with a sticky fluid which comes from his own mouth."
"I've got a lot of old nests that fell down the chimney after a storm last winter that wet the glue and made them come unstuck," said Joe; "and I'll give you each one. If you look up the hole where the kitchen fireplace was, you can see the new nests quite plain; for the birds don't build them very near the top."
"Be careful of loose stones!" called the Doctor; but in a flash four young heads had disappeared in the ruins of the great fireplace, where three pairs of trousers and a short brown linen skirt alone were visible.
In a little while they had some milk and strawberries; and before they drove on Joe's father promised to take him up to Orchard Farm to see the birds in the Doctor's wonder room, as soon as haying should be over. To the children's astonishment they found it was half-past six o'clock; they had been at the farm an hour and a half, and could not stop again until they reached the wood lane where their uncle had promised to look for the Pewee's nest.
"Stay here, little people, and ask all the questions you like of Olive," said the Doctor, when they had reached the lane; "for I shall be able to find the nest more easily if you do not frighten the birds by talking."