Cream of Barley Soup

A tea-cupful of barley, well washed; three pints of chicken stock, an onion and a small piece each of mace and cinnamon. Cook slowly together five hours; then rub through a sieve, and add one and a half pints of boiling cream or milk. If milk, add also two table-spoonfuls of butter. Salt and pepper to taste. The yolks of four eggs, beaten with four table-spoonfuls of milk, and cooked a minute in the boiling milk or cream, makes the soup very much richer.