Diodorus Siculus asserts that the Phoenicians discovered a large island in the Atlantic beyond the Pillars of Hercules several days' sail from the coast of Africa. Homer, Plutarch, and other ancient writers, refer to several islands in the Atlantic situated several thousand stadia from the Pillars of Hercules. (A stadium was a Greek measure of length equal to 600 feet. It was equal to one-eighth of a Roman mile, or 625 Roman feet.) Ignatius Donnelly, in his book, called "Atlantis, the Ante-Diluvian World," claims that Plato's description of Atlantis which has generally been regarded as imaginary, was, on the contrary, historic; that the prehistoric continent of Atlantis was the cradle of the human race; that here man reached his highest civilization; that Atlantis was the site of the Garden of Eden, the Gardens of the Hesperides, the Elysian Fields, as well as Olympus; that, under the forms of the gods and goddesses of the ancient Greeks, the Phoenicians, the Hindoos, and the Scandinavians, are related the stories of the kings, queens, and heroes of Atlantis. Much that has been claimed for the lost continent can hardly be regarded in any other light save that of imagination. For example, it has been asserted that it was from Atlantis that the colonies were sent out that peopled the coast countries of the Gulf of Mexico, of parts of the valley of the Mississippi, the basin of the Amazon, the western coasts of South America, parts of Europe, the shore lands of the Mediterranean Sea, the coasts of Europe, including the Caspian and the Black Seas, and even of parts of Africa. It has also been asserted that this mighty nation of Atlantis carried the worship of the sun to Egypt, which was one of its first colonies, and, therefore, the civilization of Egypt was but an offshoot of prehistoric Atlantis. But it will be reasonably objected that, if such a mass of land ever existed in the North Atlantic, some evidences should still be found on the bed of the ocean. Even though great periods of time have elapsed since the disappearance of Atlantis, some traces of its former existence should still remain on the floor of the ocean. Are there any evidences of an old land mass on this part of the floor of the Atlantic? The answer is unmistakable. Deep-sea soundings show beyond question that there still exists in the North Atlantic in the region where Atlantis is said to have been located a submarine island, the summits of which appear above the waters in the Azores and the Canary Islands. This submarine island has been traced southwest over the bed of the ocean for a distance of several thousand miles with a breadth of fully 1,000 miles. Toward the south there is connected with it another submarine island, the summits of which reach above the surface in the islands of Ascension, St. Helena, and Tristan d'Acunha.