This brook, like many others, in its downward course is checked at irregular intervals by hatches, built for the purpose of forcing water out into the meadows, or up to ponds at some distance from the stream at which the cattle in the sheds drink. Sometimes the water is thus led up to a farmstead; sometimes the farmstead is situate on the very banks of the brook, and the hatch is within a few yards. Besides the moveable hatches, the stream in many places is crossed by bays (formed of piles and clay), which either irrigate adjacent meads or keep the water in ponds at a convenient level. A lonely moss-grown hatch, which stands in a quiet shady corner not far from the lake, is a favourite resort of the kingfishers. Though these brilliantly coloured birds may often be seen skimming across the surface of the mere, they seem to obtain more food from the brooks and ponds than from the broader expanse of water above. In the brooks they find overhanging branches upon which to perch and watch for their prey, and without which they can do nothing. In the lake the only places where such boughs can be found are the shallow stretches where the bottom is entirely mud, and where the water is almost hidden by weeds. Willows grow there in great quantities, and some of their branches may be available; but then the water is hidden by weeds; and, being muddy at bottom, is not frequented by those shoals of roach the kingfisher delights to watch. So that the best places to look for this bird are on the streams which feed the mere (especially just where they enter it, for there the fish often assemble) and the streams that issue forth, not far from the main water. This old hatch--it is so old and rotten that it is a little dangerous to cross it--is situate in the latter position, on the effluent, and is almost hidden among trees and bushes. Several hedges there meet, and form a small cover, in the midst of which flows the dark brook; but do not go near carelessly, for the bank is undermined by the water itself and by the water-rats, while the real edge is concealed by long coarse grasses. These water-rats are for ever endangering the bay: they bore their holes at the side through the bank from above and emerge below the hatch. Out of one such hole the water is now rushing, and if it is not soon stopped will wear away the soil and escape in such quantities as to lower the level behind the hatch. These little beaver-like creatures are not, therefore, welcome near hatches and dams.