The jesses are made fast to the swivel when the hawk is not intended to fly; and swivels are of two kinds. The safest (and the most troublesome to put on and take off) is the ring-swivel (Fig. 6), consisting of a double ring in the shape of a figure 8, each end working freely on a pivot which keeps the two rings close together. It is made of brass or iron, and very good and cheap ones are to be had from Mr. Möllen, of Valkenswaard, in North Brabant. To attach the ring-swivel to the jesses, pass the end of one jess from right to left through one of the rings, and, after it is through, pass both rings through the slit in the jess, and pull tight. When the first jess is fast, pass the end of the other jess through the same ring upon which the first jess is fastened, but in the opposite direction, from left to right, and then pass the two rings through the slit as before. The second jess will pull up tight over the first, and both will be fixed firmly at the outer end of the same ring. To get the ring-swivel off, the extreme end of the jess which was last put on must be pulled until that jess becomes slack enough for the two rings to be passed through it, or, in other words, for the opening in the leather to be pulled over the rings, and, this being done, it will come away at once. After releasing one jess, take care to hold it tight between the fingers of the left hand while freeing the other jess. Otherwise, if the hawk is fidgety and jumps off, she may jerk the other jess out of your hand, and go off bodily, leash and all, into the next parish. Spring-swivels (Fig. 7) are very handy contrivances for use in the field, but not so safe for a hawk when sitting unhooded on the perch or at the block. They are shaped like the swivel by which watches are usually attached to a watch-chain, and must be so made as to turn quite freely on the pivot. To attach them to the jesses, nothing more is required than to press the side with the thumb-nail, making the spring yield, and then hook the curved end through the slit in both jesses, after which the spring is released, and the jesses remain encircled by the metal. Only, if the spring is stiff or does not work properly, there will be disasters. The unhooking process is of course even more easily and quickly effected.