Napkin Dumpling

3 cups flour
10 tablespoons butter
4 eggs,  separated and the whites stiffly beaten
3/4 cup milk
1 teaspoon salt
4 cups diced stale white bread

Cream the butter.  Add the four  egg yolks one at a time,  mixing well.  Mix salt and milk and add alternately with the flour, by spoonfuls to the butter-egg mixture.  Add the bread cubes and mix them will.  Fold in the stiffly beaten egg whites.  Wet a large cloth napkin and wring it out.  Place it in a sieve;  pour in the dough.   Pull the napkin up around the dough and tie with spring.  Tie the napkin corners to the handle of a wooden spoon and place the spoon across a deep pot containing boiling water.  The dumpling must be completely submerged, but must not touch the bottom. Cook for 20 minutes, then loosen tie and cook 40 minutes longer.  Remove the dumpling from the napkin and slice it with  thread.