In rook-hawking the lookers-on must be mounted; and their horses ought either to be very sure-footed or else well acquainted with the ground on which the flights take place, which is often covered with ant-hills, and in places bored by rabbit burrows. If the rider is to see anything of the longest and best flights, his horse must be able to step out in a gallop of a mile or so. In game- and lark-hawking it is less necessary, and often impossible, for the men to be mounted; but in these cases also it is of very great advantage for at least one man to ride, so that he may follow a very long flight with a better chance of keeping the hawk in view. The horseman has a double advantage when the country is uneven. He can go faster, and he can also from his place in the saddle see farther over the brow of a hill or undulation. But ground which undulates in long ridges and valleys is to be mistrusted by falconers. When a flight, commenced in one valley, goes over the ridge which separates it from the next, it is impossible, unless there is a marker on that ridge, to know where it may have ended. Here the falconer, for once in his life, may hope that the ground on the other side is not too open, and that there may be some small covert not far off in which the quarry is pretty sure to have stopped if he got so far. When a hawk goes out of sight over a ridge, the men following on horseback should begin to spread out like a fan, and ride on, keeping a good look-out for anything that may indicate the direction which the flight has taken. When a flight ends successfully, every person in the field should halt at a hundred yards or so from the place where the hawk is on the ground with the quarry in her foot. The falconer, or whoever it was that threw off the hawk, will use his own judgment as to when he will make in and take her up, and must go alone about this business, which, as we have seen, is sometimes delicate enough. Although it is an unpardonable mistake to make in too quickly, so as to alarm the hawk, yet it is not wise to defer too long the business of taking up. For it is always possible that a stray dog may rush in, or some other accident occur which may frighten the hawk just at the time when you most wish to save her from any such alarm.