In case, however, he takes no account of it because of its smoothness, and
						keeps bearing against it, we put large discs on the smooth bit to stop this,
						so that they may force him to open his mouth and drop the bit. It is
						possible also to make the rough bit adaptable by wrapping So as to mitigate the roughness of the teeth. This was
							sometimes done by covering the teeth with wax (Pollux. 1.207). it
						up and tightening the reins. See c. ix, §
							9. 
					 But whatever be the pattern of the bits, they must all be flexible. For
						wherever a horse seizes a stiff one, he holds the whole of it against his
						jaws, just as you lift the whole of a spit wherever you take hold of it.