The influence of manuring land is still another confirmation. We are directed not to manure our land for potatoes when the disease prevails. It is said we can raise no sound potatoes on rich land when the rot is abroad. This is an error. The richness of the soil does not promote the disease; but if any kind of manure be applied that, from its bulk and coarseness, keeps the soil open to the air, the potatoes will rot. But fertilize to the highest extent, in any way that does not make the soil too open, and let in the air, and the crop will be greatly increased with perfect safety. Thus, this theory, like every truth, perfectly fits in all its bearings. There is, then, no perfect remedy for the disease but in the power of Him who can purify the atmosphere. Numerous remedies and preventives have been recommended, by those who suppose they have tried them with success. But in other localities and soils, all their remedies have failed, as will all others that will yet be discovered. A careful examination of the texture of the soils, upon the principles here indicated, and a repetition of their experiments, will show the discoverers that their success depended upon their soils, while others failed in using the same remedies on other soils. The practical uses of this theory are obvious. When the disease is abroad, we should select soil that excludes, as much as possible, the atmosphere, and plant _deep_; on all land not liable to have water stand on the subsoil. Do not be deceived into the belief that all sandy land will bear good potatoes, in the seasons when the disease prevails. The worst rot we ever had was in 1855, on very sandy land. This year (1857) we have witnessed the worst rot in open sand and gravel. Add to this, great care in preserving the health of the tubers. Plant very early, only whole potatoes, and of mature growth, thoroughly ripe; apply a little salt and lime, plaster rather plentifully, and potash, or plenty of wood-ashes--and you will succeed in the worst of seasons. PRESERVING FRUITS, &c.