"The following method of determining the age of eggs is practised in the markets of Paris. About six ounces of common cooking salt is put into a large glass, which is then filled with water. When the salt is in solution an egg is dropped into the glass. If the egg is only one day old, it immediately sinks to the bottom; if any older it does not reach the bottom of the glass. If three days old, it sinks only just below the surface. From five days upwards it floats; the older it is the more it protrudes out of the water." - German Newspaper.
Be sure the water is at a rapid boil. Wash the eggs in warm water, leaving them in it just long enough to take off the chill. If you put them on to boil while cold you must allow twenty seconds for the shells to get warm. Boil steadily three minutes and a half, take out, wrap in a warmed napkin and send immediately to table.
Wash in warm water; lay in boiling water and remove the saucepan promptly from the fire to the side of the range where it will hold the heat, but can not possibly boil. Cover closely and leave thus for seven or eight minutes, according to the size of the eggs. It will be of a custard-like consistency all through, and be far more digestible than when the white is firm and the yolk soft.
Add a little vinegar to the water in which you poach eggs, to prevent the whites from spreading. Breaking each one into a shallow cup about a quarter of an hour before it is to be cooked is also a good plan.
Be sure the water is boiling and free from specks. If you have no egg-poacher, use a clean frying-pan. Fill with boiling water; draw to the side of the range, slip the eggs, one by one, upon the surface, set carefully back over the fire and boil gently three minutes, or until the whites are firm. Take up with a flat perforated spoon, lay upon rounds of buttered toast, trim off ragged edges and dust lightly with salt and white pepper. Celery salt gives a pleasant flavor to poached eggs, and some relish a drop of onion juice upon each.
Proceed as with those poached in water, using boiling milk instead. When done, transfer to slices of hot buttered toast laid upon a platter and pour over all a white sauce - plain drawn butter, or butter drawn in stock of some kind. Chicken stock is particularly good for this.
Have a tablespoonful of butter hissing hot in the frying-pan. Break six eggs into a bowl; add, without breaking the eggs, two tablespoonfuls of cream, or, if you have none, of milk in which half a teaspoonful of corn-starch has been wet; add pepper, salt, and a little finely minced parsley; turn all into the pan, and stir incessantly in all directions, until you have a creamy mass.
Turn out upon buttered toast or into a hot water dish and serve before the mass hardens.