cold for wheat; at about 1,500 it becomes too cold for corn; at about 2,000 it is too cold for cattle; mountain ponies graze still higher; the bleak upper slopes are left to the small and valuable Welsh sheep.
There are three belts of soil around the hills—arable, pasture, and sheep-run—one above the other. The arable land forms about a third of the country; it lies along the sea border, on the slopes above the Dee and the Severn, and in the deep valleys of the rivers which pierce far inland,—the Severn, Wye, Usk, Towy, Teivy, Dovey, Conway,and Clwyd. The pasture land, the land of small mountain farms, forms the middle third; it is a land of tiny valleys and small plains, ever fostered by the warm, moist west wind. Above it, the remaining third is stormy sheep-run, wide green slopes and wild moors, steep glens and rocky heights.
From north-west to south-east the line of high hills runs. In the north-west corner, Snowdon towers among a number of heights over3,000 feet. At its feet, to the north-west, the isle of Anglesey lies. The peninsula of Lleyn, with a central ridge of rock, and slopes of pasture lands, runs to the south-west. To the east, beyond the Conway,
