The potato, nutritive and harmless as it appears, belongs to a family suspected of very dangerous traits. It is a family connection of the deadly nightshade and other ill-reputed gentry, and sometimes shows strange proclivities to evil,--now breaking out uproariously, as in the noted potato rot, and now more covertly in various evil affections. For this reason, scientific directors bid us beware of the water in which potatoes are boiled,--into which, it appears, the evil principle is drawn off; and they caution us not to shred them into stews without previously suffering the slices to lie for an hour or so in salt and water. These cautions are worth attention. The most usual modes of preparing the potato for the table are by roasting or boiling. These processes are so simple that it is commonly supposed every cook understands them without special directions, and yet there is scarcely an uninstructed cook who can boil or roast a potato. A good roasted potato is a delicacy worth a dozen compositions of the cook-book; yet when we ask for it, what burnt, shriveled abortions are presented to us! Biddy rushes to her potato-basket and pours out two dozen of different sizes, some having in them three times the amount of matter of others. These being washed, she tumbles them into her oven at a leisure interval, and there lets them lie till it is time to serve breakfast, whenever that may be. As a result, if the largest are cooked, the smallest are presented in cinders, and the intermediate sizes are withered and watery. Nothing is so utterly ruined by a few moments of overdoing. That which at the right moment was plump with mealy richness, a quarter of an hour later shrivels and becomes watery,--and it is in this state that roast potatoes are most frequently served. In the same manner we have seen boiled potatoes from an untaught cook coming upon the table like lumps of yellow wax,--and the same article, the day after, under the directions of a skillful mistress, appearing in snowy balls of powdery lightness. In the one case, they were thrown in their skins into water and suffered to soak or boil, as the case might be, at the cook's leisure, and, after they were boiled, to stand in the water till she was ready to peel them. In the other case, the potatoes being first peeled were boiled as quickly as possible in salted water, which, the moment they were done, was drained off, and then they were gently shaken for a minute or two over the fire to dry them still more thoroughly. We have never yet seen the potato so depraved and given over to evil that could not be reclaimed by this mode of treatment.