Potatoes.—How to cook a potato. Potatoes vary very greatly in quality. Some potatoes are best boiled, and some steamed; some do best cooked in their skins, and some require peeling first; some cook in twenty minutes, some in thirty; some will only bake. As a general rule, it is more economical to boil potatoes in their skins; but they must be boiled gently, and the water strained off directly they are done, for if they break in the water there is great waste. The skins must be carefully scrubbed, quite clear, before they are boiled. When potatoes are very old, they acquire an unpleasant taste if boiled in their skins. Potatoes must never boil hard. Potatoes are best put into cold water with plenty of salt in. New potatoes are put into boiling water; they take longer to boil than old potatoes. Potatoes take longer to steam than to boil. They take about an hour to bake. To see if they are done run a fork in.