Mussel Plum Cheese and Jelly

Fill large stone jars with the fruit, which should be ripe, dry, and sound; set them into an oven from which the bread has been drawn several hours, and let them remain all night; or, if this cannot conveniently be done, place them in pans of water, and boil them gently until the plums are tender, and have yielded their juice to the utmost. Pour this from them, strain it through a jelly bag, weigh, and then boil it rapidly for twenty-five minutes. Have ready, broken small,