Foods may be classed in this connection as perishable, semi-perishable, and non-perishable. This depends somewhat for any one housekeeper upon the size of her refrigerator, and upon an available place where food may be cool, even if not so cold as in the refrigerator. Those foods classed here as perishable are those which readily “spoil,” that is, those that are affected by mold and bacteria on account of the moisture that they contain, and also those that lose flavor and freshness quickly. Those most easily affected should be kept the coldest; those in the semi-perishable group do not deteriorate so rapidly, although a low temperature is desirable with all of these. Under the non-perishable foods are classed those that are not subject to bacteria or mold in ordinary circumstances. These should be kept dry, however, and never in a heated place. In a sense, no food material is non-perishable. Insects sometimes develop in the cereal products, for instance, and the material is thus rendered unfit for food. The food adjuncts do not spoil except as they lose flavor if kept too long. _Perishable._——Milk, cream, uncooked meat, uncooked fish, shellfish, berries, fruits with delicate skins, lettuce, and vegetables that wilt easily. _Semi-perishable._——Butter, eggs, cooked meat and fish, root vegetables, cooked vegetables, left overs in general, skin fruits like apples, bananas, oranges, and lemons, dried fruits, scalded milk and cream, smoked and salted fish and meats, open molasses and sirup. _Non-perishable._——Flour, meals and cereals, sugar, salt, and other condiments and flavorings, jellies, preserves and canned goods, coffee, tea, cocoa, and chocolate.