By whatever race Europe may have been originally peopled, this portion of the world seems to have been swept by successive tribes of adventurers from Central Asia. The so-called "Allophylian race" was displaced by the Celts; the Sclaves then drove the Celts to the west, and the Tshuds into the cold regions of the north; and lastly, the Teutonic conquerors, dispossessing at will the nations that had preceded them, laid the foundation of that vast social empire which at present, in Europe, in America, in Asia, and in the new world of the South Seas, rules the destinies of half the globe. For the purposes of art, the long period of time at which we have so rapidly glanced has been divided into the Stone Period, the Bronze Period, and the Iron Period; names derived from the materials which were in general use during the progress of the various races towards civilization;—a division which, though, from its great comprehensiveness, necessarily open to some objection, seems likely to be of much use in simplifying a study hitherto embarrassing alike to the general reader, and to those whose task it is to extend the range of our knowledge.