Stir the milk into the beaten eggs; add enough flour to make a thin batter. Add the salt and baking-powder. Sour milk can be used, in which case omit the baking-powder and add a half teaspoonful of soda. The baking-powder or soda should not be put in until just before beginning to bake the cakes. The cakes will be lighter and better if the eggs are beaten separately, and the whipped whites added the last thing.