The difficulty of depicting conditions geographically in colors or with symbols is of necessity very great. The peasants who form the majority of the population of most European states often speak a different language or dialect from that of the educated upper classes, and such lines of linguistic cleavage frequently represent lines of race distinction as well. For example, in Transylvania the language of about sixty per cent of the inhabitants is Rumanian, while the literary, military and land-owning classes speak either Magyar or German, and these Hungarians and Saxons, in addition to forming everywhere the ruling class, are gathered together in many places in compact communities. A similar condition of affairs exists along the eastern boundary of the German Empire, except that here the speech of the peasants is Polish and that of the dominant classes German. The preparation of the maps which accompany this volume has been a task of peculiar difficulty. It is an easy matter to show by colors the language spoken by actual majorities, but such a delineation frequently fails to indicate the true literary language of the nation. Mr. Dominian’s solution of these difficulties has been a very successful one, and the resultant maps are really of great value, especially where they deal with little-known frontiers and obscure lines of demarcation, such as the eastern and western frontiers of the German Empire. In spite of exceptions, language gives us the best lines for the boundaries of political units whenever those frontiers conform to marked topographical features such as mountain systems. In many cases where the boundaries of language and nationality coincide they are found to lie along the crest of mountains or a well-defined watershed, often along the base of plateaus or elevated districts, and very seldom along rivers. But the boundaries of nationality and of language, when they do coincide, seldom correspond with those of race, and political boundaries are more transitory and shifting than those of either language or race. There are a few nations in Europe, chiefly small states, which are composed of sharply contrasted languages and races, such as Belgium, where the lowlands are inhabited by Flemish-speaking Teutons, and the uplands by French-speaking Alpines. Belgium is an artificial political unit of modern creation, and consequently highly unstable. The Belgian upper classes are bilingual, a condition which precedes a change of language, and unless Flanders becomes united to Holland or Germany it is more than probable that French speech will ultimately predominate there also.