The sun shines across the dooryard as it hasn't shone for so long, making a thin coat of mud just at the edge of the chips and around the doorsteps. But what matters? The children run in and out, tracking up the clean floors, taking their scolding with good cheer. Isn't spring here? and don't they hear the bluebird's note in the orchard?

Run! run! and put up some more little boxes on the shed and the fence-posts. Clean out the last year's nests in the hollow trees. Tell the old cat to "keep mum" and "lie low," or she will be put in a bag and dropped to the bottom of the very first hole in the ice. Cats are all right in the dead of winter, when Old Boreas is frantic in his annual mad fit. She can sit on the rug and purr to her heart's content; but when the bluebirds come, if she bethinks herself of the fact, and sharpens her claws against the trunk of a cherry-tree, she would better look out. When the old cat sharpens her claws she means business, especially if she turns her head in the direction of the orchard. From the orchard comes a soft, agreeable, oft-repeated note, there is a quivering of wings outspread, and "he" is here. There may be only one or two or six singers. They have left the lady bluebirds in a safe place until they are sure of the weather. If the outlook be bad to-morrow, the birds will retire out of sight and wait for another warm spell. But spring is really here, and the good work of the sun goes on. In a day or two the lady birds appear modestly, of paler hue than the males, quiet, but quick and glad of motion.

It is the time of sweethearts. A blue beauty, whose latest coat is none the worse for winter wear, alights near the mate of his choice, sitting on a twig. He goes very near her and whispers in her ear. She listens. He caresses a drooping feather, torn in her wing as she dodged the brush in the journey. She thinks it very kind of him to do so.

Suddenly an early fly appears, traveling zigzag, slowly, somewhere, probably on some family business of its own. Bluebird spies it and makes for it. Not on his own account! Oh, no! He snatches it leisurely and presents it to his love, still sitting on the tree. She thanks him, and wipes her beak on a smaller twig.

So little by little, and by very winning ways, does this gentle blue courtier pay his suit of Miss Bluebird. A chance acquaintance of bluebird sidles up to the same branch on which the two have been sitting. Bluebird courtier likes him not; he will have no rival, and so he drives the intruder away as far as the next tree, returning to his sweet and singing a low warble about something we do not understand. Probably he is giving her to understand that he will "do the right thing" by her all the time, never scolding (as indeed he never does), and looking to the family supplies, and in all things that pertain to faithful affection will prove himself worthy of her. She consents, taking his word for it, and they set about the business of the season.

Now they must hurry or the wrens will come and drive them out of house and home. One of the bluebirds remains in the nesting-place, or very near it; for if the house be empty of inmates, the wrens make quick work of pulling out such straws and nesting material as have been gathered.

If the people of the farm or other home be on the watch they can lend a hand at this time. Offered inducements by way of many boxes or nesting-places, with handfuls of fine litter, will attract the wrens, and the bluebirds will be untroubled. It may be that a cold snap will come up in a driving hurry after the nesting is well under way. In this event the birds will disappear, probably to the deep, warm woods, or the shelter of hollow trees, until the storm be past, when they will come again and take up the work where they left off.

This sudden going and coming on account of the weather has always been a mystery to those who study the bluebirds. Some imagine they have a castle somewhere in the thickest of the woods, where they hide, making meals on insects that love old, damp trees. Caves and rock chambers have been explored in search of the winter bluebirds, but not a bird was found in either place. They keep their own secrets, whether they fly far off to a warmer spot, or whether they hide in cell or castle.

If the work is not anticipated by human friends, and the nesting-places cleaned out in advance of the birds, they will tidy up the boxes themselves, both birds working at it. What do they want of last year's litter with its invisible little mites and things that wait for a genial warmth to hatch out? House-cleaning is a necessity with the bluebirds. When the nest is done it is neat and compact, composed of sticks and straws with a softer lining. The birds accept what is ready to hand, making no long search for material. Being neighbor to man and our habitations, it uses stable litter.

The three to six pale blue eggs contrast but slightly with the mother's breast. The little ones grow in a hurry, for well it is known that more broods must be attended to before summer is over. Sometimes the nest is placed at the bottom of a box or passageway, and the young birds have difficulty in making their way to freedom. The old birds in such a case are said to pile sticks up to the door, and the little ones walk up and out as if on a ladder!