To 1 quart of flour, use 2½ tea-spoonfuls of baking-powder; or, To 1 quart of flour, use 1 tea-spoonful of soda, and 2 tea-spoonfuls of cream of tartar; or, To 1 quart of flour, use 1 cupful of sour milk, and 1 tea-spoonful of soda.