Fill a basin with dilute muriatic acid, and put into it an egg, which
will sink; but, in a few seconds, the whole of the egg-shell being
covered with bubbles of carbonic acid gas, will rise to the surface,
a portion of the egg will be lifted above the surface, and the whole
egg will slowly rotate. This rotation is formed by the bubbles of
gas forming at the under part of the egg, and over all the submersed
portions, which render them lighter than the portions above the liquid
level, till the under portion ascends and the other descends.