The best filling for hatching nests is fine dry sand, mould, coal or wood ashes placed on a cut turf, covering it and lining the sides with a little well-broken dry grass, moss, bruised straw, lichen, or liverwort collected from trees, or dry heather, which is the best of all, but cannot always be had. Hay, though soft at first, soon becomes hard and matted, and is also said to breed vermin. Straw is good material, but must be cut into short pieces, for if long straw is used and the hen should catch her foot in it, and drag it after her when she leaves the nest, it will disturb, if not break, the eggs. The nests of the sitting hens in Her Majesty's poultry-yard at Windsor are made of heather, which offers an excellent medium between the natural damp hedge-nest of the hen and the dryness of a box filled with straw, and also enables her to free herself from those insects which are so troublesome to sitting hens. A thick layer of ashes placed under the straw in cold weather will keep in the heat of the hen. A little Scotch snuff is a good thing to keep the nests free from vermin. Where only a few fowls are kept, and a separate place cannot be found for the sitting hen, she can be placed on a nest which should be covered over with a coop, closed in with a little boarding or some other contrivance for a day or two, to prevent her being disturbed by any other fowls that have been accustomed to lay there. They will then soon use another nest. She should be carefully lifted off her nest, by taking hold of her under the wings, regularly every morning, exercised and fed, and then shut in, so that she cannot be annoyed. It is best to allow a hen to keep the nest she has chosen when she shows an inclination to sit; and if she continues to sit steadily, and has not a sufficient number of eggs under her, or the eggs you desire her to hatch, remove her gently at night, replace the eggs with the proper batch, and place her quietly upon the nest again. Hens are very fond of choosing their own nests in out of the way places; and where the spot is not unsafe, or too much exposed to the weather, it is best to let her keep possession, for it has been noticed that, when she selects her own nest and manages for herself, she generally brings forth a good and numerous brood. Mr. Tegetmeier observes that he has "reason to believe, indeed, that whatever care may be taken in keeping eggs, their vitality is better preserved when they are allowed to remain in the nest. Perhaps the periodical visits of the hen, while adding to her store of eggs, has a stimulating influence. The warmth communicated in the half-hour during which she occupies the nest may have a tendency to preserve the embryo in a vigorous state."