Whether the surprising effects of plaster on the potato mildew is attributable to the sulphuric acid, to the lime, or to its simply being a dust, has not been determined. It is well known that the fruits of a vineyard or orchard in close proximity to a dusty and much frequented highway are remarkably free from mildew, which can only be due to dust settling on the trees and fruit. But in the case of plaster, the writer is inclined to believe its efficacy is mainly due to the sulphuric acid, probably assisted by the lime in a state of dust. Be this as it may, it matters not. The result is all that can be desired; the remedy is easily applied, costs but a trifle, and a single season's trial is all that is needed to convince the most skeptical grower of its merits. DIGGING AND STORING Is full half the labor of growing and securing a crop of potatoes. Digging is a long, laborious task. Many small fortunes are sunk yearly by inventors in experimenting with and constructing "potato-diggers;" but, so far, no machine has done the work properly except under the most favorable circumstances. Stones, vines, and weeds are obstacles not yet fully overcome. Many tubers are left covered with earth, and so lost; and besides, some machines so bruise the potatoes in digging as to injure their appearance and keeping qualities. Undoubtedly, the day will come when the great bulk of potatoes will be dug well and rapidly by horse-power; but until that day does come, the potato-hook must be used. Much of the back-ache and general unpleasantness incident to digging is avoided, or greatly mitigated, by having the potatoes large and sound, turning out a peck to the hill, especially if the digger is the owner of the crop. Digging should be done only when the ground is dry, that the potatoes may come out clean and bright. A small plow, to turn a light furrow from each side of the rows, is some help. Pull up the vines, and lay them down so that they will be covered by the dirt dug from the hill. Commence on one side of the hill; press the hook or hoe down, so that it will reach a trifle below the potatoes, and draw the implement firmly toward you. Repeat the operation, each time placing the tool a few inches further in or across the hill, until the whole hill is dug. By this method the potatoes will not be bruised; whereas, if the digging be commenced in the centre of the hill, many potatoes will be sacrificed and much injured. Potatoes should be picked up as soon and as fast as dug; and immediately covered with straw or other material, to protect them from the light. A few hours' strong sunshine will ruin the best potato ever grown. Light changes the natural color to green, and renders the potato so bitter and unpalatable as to be wholly unfit to eat.