may be had of John S. Skinner, Esq. Baltimore, and Mr. M'Mahon, Philadelphia, and of the seedsmen in New York, Hartford, Boston, &c. The Mangel Wurtzel fell into some disrepute in England, about the year 1810, but the marchioness of Salisbury revived it. It was introduced into Ireland, in 1787, by seed from Dr. Letsom, of London, but the good qualities not being known, nor the culture, it fell into disuse in Ireland also. But a machine for the planting of it was invented by Mr. Edward Linsey, and now it is extensively cultivated there and much approved. The leaves produce two or more crops in the north of Ireland in summer and autumn, and those leaves and the roots in winter are deemed excellent for milch and beef cattle, in that great butter country. Irish sowing time is April and May. Preparation the same as for turnips and potatoes: two drills to be opened two feet apart; sufficient dung to be used, according to the state and quality of the ground. Then cover the dung with the double mould board plough, at once, or the single plough at twice, by ridging them up as high as can be well done, with a man shovelling between the drills, right and left, smoothing the surface of the dung, which will leave the ridge about a space of ten or twelve inches broad. This complete method of fallowing will repay the trouble of shovelling, by raising a full proportion of earth under the roots. When the ground is thus completely prepared, two boys or girls can sow from two to three acres per day. After sowing, it should be well rolled, which completes the process. The crop is afterwards to be treated in the same manner as turnips or potatoes, by putting to and taking off mould, &c. After the roots have been raised, the ground is in fine order for wheat or any other crop. _Example of Cultivation._--Wolf M'Neil, Esq. Ireland, sowed one acre; from the leaves, fed 40 pigs through the seasons of last summer and fall; then gathered 84 tons of roots.--On these fed nine cows and five calves during winter, and had, on 22d April, 1815, eight tons remaining, besides 100 roots, which he transplanted for securing good seed, _an all-important object_ in this culture. (To be continued.) [We recommend to our readers the purchase and study of "_The Code of Agriculture_," written by Sir John Sinclair, the first president of the _public_ British Board of Agriculture. London edition, about 612 pages in one octavo volume; also, American Hartford edition, Connecticut. It is probably the first farmer's manual, or _handbook_, extant in our language, and was concocted by the labours of 26 years, and with the aid of 1000 persons.] _Valuable Breed of Cattle._