N the last chapter we described the manner in which a certain class of islands in the South Seas are formed; in the present we will make a few observations on another class, which have sprung up from the bottom of the sea, as if by magic, under the irresistible influence of fire.
There are volcanoes in the sea, as well as on the land; and these volcanoes have in former times upheaved huge masses of land so as to form large islands, while in other cases they have caused islands formerly in existence to subside and disappear.
In the writings of the ancients we find reference made to an island which, if it ever did exist, now exists no longer. It was situated opposite the Straits of Gibraltar, was nearly two hundred miles in length, and was called "Atlantis"—hence the name of the Atlantic Ocean. Many believe, and
