Our historian would then go on to describe the early 'wanderings of peoples' (_Voelkerwanderungen_) how whole tribes would move off in the spring-time in the search for fresh hunting-grounds or pasture. He would trace the course of that westward push which, starting from somewhere in Asia, brought its impact to bear on the northern provinces of the Roman Empire and eventually loosened its whole fabric. He would show how Europe, as we know it, was welded into unity by the attacks of migratory warriors on three flanks--the Huns and the Tartars, a host of horsemen riding light over the steppes of Russia and Hungary: the Arabs, bearing Islam with them on their camels as they moved westward along North Africa and then pushing across into Spain: and the Northmen of Scandinavia, those carvers of kingdoms and earliest conquerors of the open sea, who left their mark on England and northern France, on Sicily and southern Italy, on the Balkan Peninsula, on Russia, on Greenland, and as far as North America. Then, passing to Africa and Asia, he would describe the life of the pack-saddle and the caravan, the long and mysterious inland routes from the Mediterranean to Nubia and Nigeria, or from Damascus with the pilgrims to Medina, and the still longer and more mysterious passage through the ancient oases of Turkestan, now buried in sand, along which, as recent discoveries have shown us, Greece and China, Christianity and Buddhism, exchanged their arts and ideas and products. Then he would tell of the great age of maritime discovery, of the merchant-adventurers and buccaneers, of their gradual transformation into trading companies, in the East and in the West, from companies to settlements, from settlements to colonies. Then perhaps he would close by casting a glimpse at the latest human migration of all, that which takes place or took place up to 1914, at the rate of a million a year from the Old World into the United States. He would take the reader to Ellis Island in New York harbour, where the immigrants emerge from the steerage to face the ordeal of the Immigration Officer. He would show how the same causes, hunger, fear, persecution, restlessness, ambition, love of liberty, which set the great westward procession in motion in the early days of tribal migration, are still alive and at work to-day among the populations of Eastern Europe. He would look into their minds and read the story of the generations of their nameless fore-runners; and he would ask himself whether rulers and statesmen have done all that they might to make the world a home for all its children, for the poor as for the rich, for the Jew as for the Gentile, for the yellow and dark-skinned as for the white.