The Two Eggs.
Dissolve as much common table-salt in a pint of water as it will take up, so as to prepare a strong brine. With this brine half fill a tall glass. Then pour in pure water, very carefully. Pour it down the side, or put it in with the help of a spoon, so as to break the fall. The pure water will then float upon the top of the brine, yet no difference will be visible. Next, take another glass of exactly the same kind, and fill it with pure water. Now take a common egg, and put it into the vessel of pure water, when it will instantly sink to the bottom. Put another egg into the first glass, and it will not descend below the surface of the brine, seeming to be miraculously suspended in the middle. Of course the two glass vessels should be considerably wider than the egg is long.