Each set of boxes must have one _close cover_, which should be an inch thick and well clamped at each end to prevent warping, as a considerable quantity of steam arises from the bees at certain seasons. The top, being intended to take off and on, should be secured by means of four screws, each placed about an inch and a half from the respective corners; and it should also be fitted to, and screwed down upon, all the boxes before any of them are used, that whenever it may be necessary to remove, or to add a box, the change may be effected with the utmost promptitude. Long taper screws, as nearly of the same size as possible, should be selected for fastening on the tops, and be dipped in grease before put in, to facilitate their removal. Each set of boxes must also have a _loose floor_, an inch thick and extending about an inch and half beyond the back and sides of the boxes. The outlet for the bees is usually cut in the lower edge of the boxes, but I have found it much more convenient to have it formed by sinking the floor half of its thickness at the centre of its front edge. The width of the part sunk should be about four inches, and should gradually diminish in depth till it reach the centre of the board. The sloping direction thus given will, in case of beating rain or condensed steam falling upon it, prevent any wet from lodging within the hive. The floor must also be clamped at the ends, to prevent warping, though the superincumbent weight renders it less liable to be warped than the top. Either on the right or left hand side of the entrance, as may be most convenient, a _groove_ must be cut half an inch deep and half an inch wide; to this groove a _slide_ must be fitted (made to run easily), for the purpose of closing the box, and preventing the egress or ingress of the bees, as occasion may require. [Illustration] A _centre board_ between each tier of boxes will likewise be convenient; it should be of the same size as the floor, and have an oblong hole about six inches by four in the middle, to give liberty to the bees to pass from box to box. Apiaries should always have a few supernumerary boards of each sort, and also some supernumerary boxes.