Of the root crops the POTATO is the first to be mentioned. This produces a large quantity of milk, though the quality is inferior. The market value of this root is, at times, too great to allow of feeding extensively with it, even in milk dairies, where it is most valuable as a food for cows; still, there are locations where it may be judicious to cultivate this root for dairy feed, and in all circumstances there is a certain portion of the crop of unmarketable size, which will be of value fed to milch cows or swine. It should be planted in April or May, but in many sections in June, on good mellow soil, first thoroughly plowed and harrowed, then furrowed three feet apart, and manured in the furrows with a mixture of ashes, plaster of Paris, and salt. The seed may be dropped in the furrows, one foot apart, after the drill system--or in hills, two and a half or three feet apart--to be covered with the plough by simply turning the furrows back, after which the whole should be rolled with the field-roller, when it can be done. If the land is not already in good heart from continued cultivation, a few loads of barnyard manure may be spread, and plowed under, by the first plowing. Used in this way it is far less liable to cause the rot, than when it is put in the hill. If a sufficient quantity of wood-ashes is not at hand, sifted coal-ashes will answer the purpose, and these are said to be valuable as a preventive of rot. In this way, one man, two boys, and a horse can plant from three to four acres a day on mellow land. By another method two acres a day on the sod have been planted. The manure is first spread upon the grass, and then a furrow made by a yoke of oxen and one man, another following after and dropping, a foot apart, along the outer edge of the furrow on the grass. By quick work, one hand can nearly keep up with the plow in dropping. When arrived at the end of the piece, a back furrow is turned up to the potatoes, and a good plowman will cover nearly all without difficulty. On the return furrow, the man or boy who dropped follows after, covering up any that may be left or displaced, and smoothing off the top of the back-furrows when necessary. Potatoes thus planted have come out finely. The cost of cultivation in this mode, it must be evident, is but trifling, compared with the slower method of hand-planting. It requires a skillful ploughman, a quick, active lad, and a good yoke of oxen, and the extent of the work will depend somewhat upon the state of the turf. The nutritive equivalent for potatoes in a hundred pounds of good hay is 319 pounds; that is, it will take 3.19 pounds of potatoes to afford the same amount of nourishment as one pound of hay. The great value of roots is as a change or condiment calculated to keep the animal in a healthy condition. [Illustration: A WEST HIGHLAND OX.]