Eggs are good for you
Second only to meat when it comes to culinary diversity are eggs. This excellent foodstuff full of nourishment holds benefits for the healthy and sick, rich and poor alike.
Fresh eggs soothe soreness of the chest; old ones are liable to upset those of a choleric or nervous temperament. To find out whether eggs are fresh, hold them up to the light: if they are clear and transparent, this is a good sign. If they look spotty, put them with the old eggs, and if they have a mark attached to the shell, this indicates that they are no good. The yolk of a fresh egg mixed into some hot water with a little sugar and drunk while lying down is good for people with a cold; this medicinal eggnog is called “lait de poule” (hen's milk) by the French.
As the supply of eggs to a household was a major resource, and since they were expensive in the winter, those running the household who kept poultry had to collect eggs for the winter in between 15 August and 8 December. For this purpose, store them in a place which is neither too hot nor too cold, the cellar is good as long as it is completely dry. Put them in a barrel full of straw in summer; in winter, store them in hay. Some people use sawdust, stubble or ash.
Eugène Ardant, La cuisinière des cuisinières, de la ville et de la campagne, Limoges : 1867