If any vacant places should happen in any of these drills, such vacancies may readily be supplied by transplanting sets, taken from parts where more plants are standing than are necessary. Any young plants may be transplanted after they have attained a suitable size, which is usually in from two to four weeks growth. The vacancies may be quickly filled by transplanting, and it is a matter well worthy of attention. The practice, lately introduced, of laying barn dung at a good depth, and then covering it with mould to the depth of about three or four inches, and planting the seeds over the manure thus covered, seems to answer the best purpose for every drilled crop except potatoes, and we would therefore recommend this method of using barn dung in preference to every other, as far as it may be wanted for drilled crops. In this way this manure may be profitably applied while fresh; but in many instances we consider it more efficacious when applied after the process of rotting or fermentation has commenced. Such is the theory of Sir Humphrey Davy, and we have full confidence in its correctness. When thus buried in the earth, the growing plants, placed above the manure, have the utmost means of absorbing all its garious and soluble parts, while the process of its decomposition is going on. In preparing seeds we would, as a general rule, advise to their being soaked about 12 hours in a strong solution of saltpetre, or of common salt, and then rolled in gypsum before being committed to the earth. The effect of this mode of preparing the seed seems to be, that the young plants start with more vigour, and grow larger than they do where this treatment of the seed is neglected; and the solution of saltpetre has the further effect of bringing plants to maturity from one to two weeks sooner than they otherwise would ripen. In selecting seed for the corn crop, take such stalks as bear two ears, and select the best ear from each of such stalks, the grains on each end to be rejected. In all cases where it is practicable, the seeds should be taken from the largest and most perfect plants, or roots, as the case may be. By attending to this mode of selecting seed the product of the corn crop in particular will soon be found greatly augmented; a discovery, the honour of which is due to Mr. Cooper, of New Jersey. It is said that sprinkling a little gypsum on the silk of the ears of corn, will make them fill to the ends. Nipping off the blossoms of the potato crop, as fast as they appear, is found, by accurate experiment, to increase the growth of the roots about one sixth part. Salt and gypsum have each a powerful effect on their growth, though by applying too much of the latter it may cause them to run too much to vines. To the corn and pumpkin crop apply some of this latter manure after the plants are up. What effect it has on turnips we have never understood.