Potato Soup

Boil in their skins about a dozen medium-sized potatoes, and when done, peel
and pass them through a fine sieve. Put a lump of butter about the size of an egg in
a saucepan, let it melt, and add a tablespoonful of arrowroot, and stir over the fire
until well browned; then add the potatoes with as much well flavored stock as will
be required for the soup; boil all together. When done, pour the soup into a soup
tureen, and serve while hot with a plate of sippets of toast or croutons of fried bread.