Rinse peas; pick over. Place in bowl; cover with water. Soak overnight. Drain any remaining liquid from peas; add water to make 10 cups of liquid. Combine peas and liquid in Dutch oven.
Rinse pig’s feet under running water; add to peas. Bring to boil. Skim any foam. Reduce heat to low; cook 1 1/2 to 2 hours. Remove pigs’ feet. Add vegetables and seasonings; cook 1 hour more. When pigs’ feet have cooled, remove skin and bones; chop meat. Puree soup in electric blender or pass through a sieve. Add chopped meat.
Melt butter in small saucepan. Add flour; cook until bubbly. Add small amount of soup to flour mixture, stirring well. Pour back into soup kettle. Stir well; cook 5 minutes.
Next make croutons. Remove crusts from bread; cut into 1/2 inch cubes. Melt butter in heavy skillet; fry bread cubes over moderate heat until golden. Drain; serve sprinkled on soup. Makes 6 to 8 servings.