The Mangel Wurtzel also possesses one peculiar advantage above all other root crops, that as soon as the tops or leaves, are full grown, they may be stripped off (leaving only the small heart-leaves uninjured) and given to cattle and swine.--This stripping may be repeated once or twice; and it is said that the roots thrive better for the stripping. If not stripped off many of the under leaves perish. The leaves are pronounced excellent for increasing the richness and quantity of milk in cows; and so are calculated to supply the deficiency of herbage in the common pastures, which generally fail, more or less, by the beginning of August. An acre twice stripped will yield several tons of leaves. THE RUTA BAGA. This root may be cultivated in the manner just described for the Mangel Wurtzel; the ground being prepared in the same manner. In England, they appear to be most commonly grown in rows 27 inches apart, with the plants at a foot distance in the rows. But William Cobbett, who in a small book, published in New York, has minutely described his own practice, both in England and America, asserts, that the largest crops are attainable by growing the Ruta Baga in rows four feet apart, with the plants about 10 inches or a foot distant from each other in the rows: and in this mode of culture, he has raised, in England, 30 tons to the acre. For this mode of culture, the manure, being deposited in furrows 4 feet apart, is covered by 4 back furrows, 2 on one side and 2 on the other, of each line of manure; by which little ridges are formed: and if the ploughing be deep (as it ought to be) there will be a deep gutter between every two ridges.--The tops of the ridges being made fine with a light harrow, or with rakes, the seeds are sown with a drilling machine; or by hand, which Mr. Cobbett says he prefers to a drill. Two men sowed for him 7 acres in 3 days, using about 4 pounds of seed, in this manner; a man went along by the side of each ridge, and put down 2 or 3 seeds in places at about 10 inches from each other, just drawing a little earth over, and _pressing it on the seed_, in order to make it vegetate quickly, before the earth became too dry. But, he adds, the 7 acres might have been sown by one man in a day, by just scattering the seeds along on the top of the ridge, where they might have been buried with a rake, and pressed down with a spade or shovel, or other flat instrument. But he used a light roller, to take two ridges at once, the horse walking in the gutter between. The time of sowing the seeds must vary with the climate. On Long Island, (state of New York) Mr. Cobbett's trials of one year led him to prefer the 26th of June; but in our own county, I would not pass the middle of that month. Indeed I think it expedient (in order to ascertain the fittest time) to commence sowing the seed as soon as the ground can be prepared after the planting of Indian corn, and to continue to sow, in small plots, weekly, until the middle of June.