This section is from the book "Hints To Housewives On How To Buy, How To Care For Food", by Mayor Mitchel's Food Supply Committee. Also available from Amazon: Hints to Housewives on How to Buy, How to Care for Food.
As the shells of eggs are porous, air and germs can get into the eggs through the shell and make them unfit to eat. No eggs are perfectly clean when bought; therefore it is best to wipe them with a clean, damp cloth as soon as you get them home. Clean eggs, kept cool, remain for a week or more practically as good as when laid. As hens lay best in spring and early summer, it is necessary to preserve the eggs that are needed for winter use. Dealers use the cold-storage method, but housewives can preserve eggs at home by using either of the following methods :
1. By Coating Them With Water Glass. Water glass does not cost much. You can buy it at almost any drug or department store.
Directions: Mix water glass with water, using 9 parts of water to 1 part water glass. Put eggs in a stone jar and pour water glass over them, being careful to see that they are well covered. Keep the jar of eggs in a cool place. If you want to boil eggs that have been preserved in water glass it will be necessary to make a tiny pin-hole in the small end of each egg before putting them into the boiling water; otherwise they will explode.
2. By Greasing Them. They can be greased with butter, any butter substitute, lard or in fact any clean fat.
Directions: The grease must be soft enough to be applied with a brush. Be careful to see that the entire egg is greased. Then pack the eggs, small end down, in any wooden box, putting a strip of cardboard between each egg so that the eggs do not touch each other. Keep the box of eggs in a cool place.
3. By Packing Them In Sawdust.
Directions: Pack eggs in sawdust, small end down. Be sure that each egg is entirely covered with the sawdust. You can use any wooden box to pack them in. Keep the box of eggs in a cool place.