Generally, in shallow setting, whether in large or small pans, cooling the milk in air is depended upon. Formerly, an underground room, or one in a shady place, was the only appliance usually resorted to for cooling. But, of late years, some method of artificially cooling the air by the use of ice is generally adopted. In some cases, the milk room is made small, with low ceiling and double walls, so that a cake of ice near the ceiling does the cooling. Usually, however, some sort of refrigerator construction is resorted to, so that cool air from the ice-house, or ice placed above the milk room, is introduced to regulate the temperature and keep it steady. We prefer cooling in air, though it may take a little more space and time. By this method, extremely rapid cooling and low temperature are avoided, and no violence is done to the milk or cream. Deep setting, it is true, exposes less surface to the air; but if the milk is not submerged, the surface is likely to be cooler than the air above, and to condense the vapor in it, which falls with all its impurities on the surface of the cream. Any foulness or bad odors are thus absorbed and go into the butter product. While submerging obviates this objection and keeps out all impurities from the air, it also prevents all escape of bad odors by evaporation. Whatever that is objectionable may be in the milk is retained there. By setting in open air, which should of course always be pure and sweet, the air, being cooled down and used as a medium for cooling the milk, takes up the exhalations of moisture and odor from the milk, and thus purifies it. The colder medium is always the condenser and absorbent, and it is only when the milk gets colder than the air above it that it condenses the moisture in the air and absorbs its odor. This will never occur where cold air is the cooling medium. The milk theoretically can never get cooler than the air, while practically it remains a degree or two warmer than the air. OXYDIZING CREAM.