The very stout flannel called double-mill, used for ironing-blankets, is the best material for a jelly-bag: those of home manufacture are the only ones to be relied on for thoroughly clearing the jelly. Care should be taken that the seam of the bag be stitched twice, to secure it against unequal filtration. The most convenient mode of using the big is to tie it upon a hoop the exact size of the outside of its mouth; and, to do this, strings should be sewn round it at equal distances. The jelly-bag may, of coarse, be made any size; but one of twelve or fourteen inches deep, and seven or eight across the mouth, will be sufficient for ordinary use. The form of a jelly-bag is the fool's cap.