The other form is more like a beer or brandy cask on end, being smaller at each end than in the middle, and is called the barrel-churn. Both kinds are made of oak-wood, and have wooden or broad metal hoops. In the one case they are painted outside; in the other, they remain of the natural color, but are the more frequently scoured, so that the dark-colored oak-wood gets a whitish color. The metallic hoops are always kept polished bright. Both kinds are of different sizes, according as the quantity of cream is greater or less, or as they are to be worked by hand or animal power simply, or by machinery. In South Holland, where unquestionably the most butter is made, the barrel-churn is at each end about two feet and two inches in diameter, and in the centre is seven inches broader, with two-inch staves. The old churn, on the other hand, is usually fourteen inches at the top and twenty-five at the bottom. In North Holland and West Friesland, also, sizes are found in which one hundred and fifty to two hundred quarts of cream can be churned. The churns have each a strong cover at the top, which fits into their rim about the thickness of the hand, with a hole in the middle for the dasher. The churning is performed either by the hand motion of the dasher, as in all small dairies, and in the smallest churns, or by man-power with the help of certain mechanical contrivances. The means for effecting this are different, and so the churns have different names. In many dairies, for instance, they have a lever connected with the dasher; in other places they use a flexible pole, fixed into the ceiling above, for facilitating the motion of the dasher, or put a lever in motion with the feet, which raises and sinks the dasher. There are also complicated artificial butter-machines and butter-mills, which are named after the inventor, the manufacturer, or the motive power. The most known and widely used are the turning-mills, the wheel-mills, and the clock-work mills; as the Hand Butter-Mill of Valk, Fürst’s churn, etc. There are also still more elaborate machine-works for moving the dasher, which are used in the larger dairies on account of their convenience and economy. Dog-power and horse-power churns are frequently met with. CHURNING IN THE COMMON CHURN.--The use of this is well known. The dasher is moved up and down by hand, with the churn full of cream, till the butter particles are separated and collected together. The operator keeps his body in equilibrium, to exercise the power of moving the dasher regularly for agitating the cream.