CLAY-lands, those abounding with clay, whether black, blue, yellow, white, &c. of which the black and the yellow are the best for corn.
All clay-foils are apt to chill the plants growing on them in moist seasons, as they retain too much water: in dry seasons, on the contrary, they turn hard and
VOL. VI. Part I.
choke the plants. The natural produce of clay foils is goose-grass, large daisies, thistles, docks, poppies, &c. Some bear clover and rye-grass; and, if well manured, produce the best grain: they hold manure the best of all lands; and the most proper for them are horse-dung, pigeons-dung, some kinds of marl, folding of sheep, malt-dust, ashes, chalk, lime, soot, &c.