If the land is not already in good heart from continued cultivation, a few loads of barn-yard manure may be spread, and ploughed under by the first ploughing. Used in this way, it is far less liable to cause the rot than when put in the hill. If a sufficient quantity of wood-ashes is not at hand, sifted coal-ashes will answer the purpose, and are said to be valuable as a preventive of the rot. In this way one man, two boys, and a horse, can plant from three to four acres a day on mellow land. I have planted two acres a day on the sod, the manure being first spread on the grass, 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 plough in dropping. When arrived at the end of the piece, a back furrow is turned up to the potatoes, and a good ploughman 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 where necessary. Potatoes thus planted came out as fine as I ever saw any. The cost of cultivation in this mode, it must be evident, is but trifling compared with the slower method of hand-planting. The plan will require a skilful ploughman, a quick, active lad, and a good yoke of oxen, and the extent of the work will depend somewhat on the state of the turf. The nutritive equivalent in potatoes for one hundred pounds of good hay is 3.19 pounds; that is, it will take 319 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. THE CARROT (_Daucus carota_) is somewhat extensively fed, and is a valuable root for milch cows. This, like the potato, has been cultivated and improved from a wild plant. Carrots require a deep, warm, mellow soil, thoroughly cultivated, but clean and free from weed-seed. The difference between a very good profit and a loss on the crop depends much on the use of land and manures perfectly free from foul seeds of any kind. Ashes, guano, sea-weed, ground bone, and other similar substances, or thoroughly-rotted and fermented compost, will answer the purpose. After ploughing deep, and harrowing carefully, the seed should be sown with a seed-sower, in drills about eighteen inches apart, at the rate of four pounds to the acre, about the middle or twentieth of May. The difference between sowing the fifteenth of May and the tenth of June in New England is said to be nearly one third in the crop on an average of years. In weeding, a little wheel-hoe is invaluable, as with it a large part of the labor of cultivation is saved. A skilful hand can run this hoe within half an inch of the young plants without injury, and go over a large space in the course of a day, if the land was properly prepared in the first place.