The Book of Household Management by Mrs. Beeton

of boiling must be carefully removed, otherwise it will attach itself to the meat, and thereby spoil its appearance. The cook must not neglect to skim during the whole process, though by far the greater part of the scum rises at first. The practice of wrapping meat in a cloth may be dispensed with if the skimming be skillfully managed. If the scum be removed as fast as it rises, the meat will be cooked clean and pure, and come out of the vessel in which it was boiled, much more delicate and firm than when cooked in a cloth.