EGGS.—To prove whether they are good or bad, hold the large end of the egg to your tongue; if it feels warm, it is new; but if cold, it is bad. In proportion to the heat or cold, is the goodness of the egg. Another way to know is to put the egg in a pan of cold water; the fresher the egg, the sooner it will fall to the bottom; if rotten, it will swim. If you keep your eggs in ashes, salt or bran, put the small end downwards; if you turn them endways once a week, they will keep some months.
—from The American Frugal Housewife
by Lydia Maria Child