Deep setting, whether in pails or pans, is always accompanied with water and the use of ice. In many instances, however, where running water is abundant, ice is dispensed with, and the pails are set in pools or tanks, while the pans have water run around them, if not under them. Under-cooling, however, is pretty well understood to be a disadvantage, unless the vessel containing the milk is submerged in water or nearly so. Ice is a good deal used, and the milk rapidly run down in temperature. Some think this is the better as well as the quicker way, if not the only way to get all the cream. Our only objection to this rapid cooling is that it runs the temperature too low, and, in our opinion, injures the keeping quality of the product. EFFECT OF TOO LOW COOLING. If run below 40 degrees, or the point where water begins to expand, all cooling below that point lessens the difference in specific gravity between the water and the fat globules, and operates diametrically in the opposite direction to what is desired. The aim is to condense the water, which is a good conductor, and leave the fat globules, which are poor conductors, unchanged or but slightly contracted. In this way, the heavier fluid settles and drives the light particles of fat upward to rest on the surface. But, if we go below 40 degrees, we produce the directly opposite effect and retard the rising of the cream. For quality, we prefer the slower cooling in water, and think the longer time given will secure all the cream available and in a purer condition. BUTTERMILK FLAVOR. If more cream or butter is obtained by rapid cooling, we think it is because more particles of caseine are entangled in the cream and remain in the butter when churned. This would of course make more weight for market, but of inferior quality and sooner to go off flavor. But where the butter is consumed fresh from the churn, this does not matter so much; and if the particles of caseine give the butter a slight buttermilk flavor, it pleases some palates that have been educated to like it. We, however, prefer the sweet, delicate flavor of cream butter, free from caseine or lactic acid. But, if one has a special line of customers, he must please them, whatever the demand may be. If the butter is thrown on the general market, and there is liable to be delay in getting it into consumption, it cannot be made too pure, nor retain its rosy flavor too long. SHALLOW SETTING AND AIR COOLING.