The leash can now be attached to the swivel. And leashes, again, may be of two kinds. The orthodox leash for peregrines and big hawks is a strip of tough leather, about half an inch wide, and a yard long, provided with a stout button at one end, which is made in the following way:--In cutting the leash, three inches or so at one end are cut rather broader than the rest of the strip. This broad end is then rolled up tightly by doubling it over and over upon itself. After the broad part has been rolled up, a hole is punched right through the roll, and the other end of the leash, which is tapered to a point, is pushed through and pulled tight. A sort of square button will thus be formed at the thick end of the leash (Fig. 8); and if the thin end of it is passed through the outer ring of the swivel--that ring to which the jesses are not attached--it will run right through until the ring encounters the button, which is too big to get past. The whole length of the leash is then available for the purpose of tying up the hawk to her block, or to a peg in the ground. There is a right and a wrong way about even so simple a matter as tying up a hawk. Blocks and pegs ought always to be provided with a ring or staple, round which to tie the leash; and it should be tied in what is called a falconer's knot, which can easily be negotiated with one hand. To begin with, pass the thin end of the leash through the ring. Then make a loop in the part which has gone through the ring, and pass the loop round that part of the leash which has not gone through the ring. Pull tight, and the leash will assume an appearance resembling that shown in Fig. 9. Next pass the end (A) through the loop (B), and again pull tight. It will be impossible for any strain upon the leash at C to undo the knot. And when it is desired to undo it, the end (A) can easily be picked out with the fingers through the tightened loop (B), and a simple pull upon A will then undo the whole fastening. For attaching hawks to the screen-perch, a sort of double falconer's knot is required for fastening the two ends of the leash round the pole. But it is learnt with the greatest ease. Nothing more is necessary than to take the two ends of the leash--the thick and the thin--and pass one over and one under the pole. Then tie them together, just as if you were tying a black necktie, except that you make only one bow instead of two. Let this one bow, when the knot is pulled tight, be about four inches long; and through the loop formed by it pass the two ends of the leash, which will naturally be found on the reverse side of the knot (Fig. 10). When the hawk is carried on the fist, the ends of the jesses, the swivel, and button of the leash will often lie in the palm of the left hand. The leash will hang down for some inches, perhaps a foot, and then, forming a loop, be gathered up to the little finger, round which the lower part, a few inches from the thin end, is wound for the sake of extra security.