This idea was strengthened by the knowledge that the country possessed neither strong natural frontiers, like Great Britain, France, Italy or Spain, nor the bond created by unity of language like Germany. Other European countries, it is true, like Holland or Poland, did not constitute strong geographical units and lacked definite boundaries but their people talked at least the same idiom and belonged, as far as the word may be used in a broad sense, to the same race. Others, like Switzerland, were divided between various languages, but possessed geographical unity. Belgium could not claim any of these distinctive features. Her boundaries remained widely open in all directions. From the cultivated plains of Flanders to the wild hills of the Ardennes she offered the greatest variety of physical aspects. What is more, her people were nearly equally divided, by a line running from the south of Ypres to the north of Liege, between two different languages, two different races. According to recognized standards, the very existence of the Belgian nation was a paradox, and though the history of mankind presents many similar contrasts between the hasty conclusions of the untrained mind and the tangible reality of facts, these cannot be recognized at first, and require a deeper knowledge of the past than that which can be provided by the study of warlike conflicts and political changes. It was therefore left to the modern school of Belgian historians, and more especially to Professor Pirenne, of Ghent, to place the study of the origin of the Belgian nation in its right perspective and to show that, in spite of diversity of race and language, lack of natural boundaries and centuries of foreign domination, Belgian unity was based on deep-rooted traditions and possessed strong characteristics in every department of human activity which could be recognized from the early Middle Ages to the modern period. By a close study of the economic and intellectual life of the people and of their institutions, Pirenne and his disciples made evident what every artist, every writer had already realized, that, in spite of all appearances, Belgian unity had never been impaired in the past by the language barrier, and that both parts of the country presented common characteristics, common customs, and common institutions which no foreign rule was able to eradicate. They showed furthermore that these characteristics, determined by the common interests and aspirations of the whole people, were so strong that they inspired the policy of many foreign princes who, by their birth, would naturally have been led to disregard them. They may still be found in the country's old charters, in ancient chronicles, in the works of the so-called Flemish School of painting, and in every monument of the past which has survived the devastation of war. To these witnesses Belgian historians will not appeal in vain, when they endeavour to show that