But, whatever the type of bit may be, let it in any case be flexible. If it be stiff, at whatever point the horse seizes it he must take it up bodily against his jaws; just as it does not matter at what point a man takes hold of a bar of iron, (5) he lifts it as a whole. The other flexibly constructed type acts like a chain (only the single point at which you hold it remains stiff, the rest hangs loose); and while perpetually hunting for the portion which escapes him, he lets the mouthpiece go from his bars. (6) For this reason the rings are hung in the middle from the two axles, (7) so that while feeling for them with his tongue and teeth he may neglect to take the bit up against his jaws. (5) Or, "poker," as we might say; lit. "spit." (6) Schneid. cf. Eur. "Hippol." 1223. (7) See Morgan, note ad loc. Berenger (i. 261) notes: "We have a small chain in the upset or hollow part of our bits, called a 'Player,' with which the horse playing with his tongue, and rolling it about, keeps his mouth moist and fresh; and, as Xenophon hints, it may serve likewise to fix his attention and prevent him from writhing his mouth about, or as the French call it, 'faire ses forces.'" To explain what is meant by flexible and stiff as applied to a bit, we will describe the matter. A flexible bit is one in which the axles have their points of junction broad and smooth, (8) so as to bend easily; and where the several parts fitting round the axles, being large of aperture and not too closely packed, have greater flexibility; whereas, if the several parts do not slide to and fro with ease, and play into each other, that is what we call a stiff bit. Whatever the kind of bit may be, the rider must carry out precisely the same rules in using it, as follows, if he wishes to turn out a horse with the qualities described. The horse's mouth is not to be pulled back too harshly so as to make him toss his head aside, nor yet so gently that he will not feel the pressure. But the instant he raises his neck in answer to the pull, give him the bit at once; and so throughout, as we never cease repeating, at every response to your wishes, whenever and wherever the animal performs his service well, (9) reward and humour him. Thus, when the rider perceives that the horse takes a pleasure in the high arching and supple play of his neck, let him seize the instant not to impose severe exertion on him, like a taskmaster, but rather to caress and coax him, as if anxious to give him a rest. In this way the horse will be encouraged and fall into a rapid pace. (8) i.e. "the ends of the axles (at the point of junction) which work into each other are broad and smooth, so as to play freely at the join." (9) "Behaves compliantly."