Split Pea Soup

For each quart of soup desired, simmer a cupful of split peas very slowly in three pints of boiling water for six hours, or until thoroughly dissolved. When done, rub through a colander, add salt and season with one half cup of thin cream. Reheat, and when boiling, stir into it two teaspoonfuls of flour rubbed smooth in a little cold water. Boil up until thickened, and serve. If preferred, the cream may be omitted and the soup flavored with a little celery or onion.