The present line of linguistic demarcation in Alsace-Lorraine rarely coincides with the political boundary. Conformity between the two lines is observable only in stretches of their southernmost extension. East and southeast of Belfort, however, two well-defined areas of French speech spread into German territory at Courtavon and Montreux. In the elevated southern section of the Vosges, the line runs from peak to peak with a general tendency to sway east of the crest line and to reveal conspicuous deflections in certain high valleys of the eastern slope. Its irregularity with respect to topography may be regarded as an indication of the fluctuations of protohistoric colonization. From Bären Kopf to about 10 miles beyond Schlucht Pass, the mountainous divide and the linguistic line coincide. Farther north, however, French prevails in many of the upper valleys of the Alsatian slope. This is true of the higher sections of the Weiss basin, as well as of the upper reaches of the Bruche. At a short distance south of the sources of the Liepvre, parts of the valley of Markirch (Sainte-Marie-aux-Mines) are likewise French. Here, however, the influx of German miners, who founded settlements as far back as the seventeenth century, converted the district into an area linguistically reclaimed by Germans. The linguistic boundary in the valley of the Bruche corresponds to the dividing line between houses of the Frank-Alemannic style and those of the purely Alemannic.[33] Villages of the Frank-Lorrainer style, in which narrow façades, flat roofs and close lining-up of houses are observable, belong to the period of French influence which followed the Thirty Years’ war and should not be confused with the former types. In Lorraine the houses are built with their longest sides parallel to the street. The entrance leads into the kitchen; rooms occupy the left wing of the building, the right providing stable space. In some respects this structure recalls the Saxon houses met east of the Elbe valley. The characteristic feature of the Lorraine dwelling, however, is found in the construction of the entrance on the long side, whereas in the German type of house it lies under a gable on the short side. As a rule the Alemannic type of house prevails in the mountainous sections and attains the valleys of the Meurthe. In the Vosges, Black Forest and Swabia these dwellings are distinguishable by their characteristic inclusion of all outhouses and barns under a single roof. In the densely peopled valley of the Bruche the most important settlements rest on the alluvial terraces of its affluents. In the upper valley the villages are scattered on rocky amphitheaters, and here the Celtic type of settlement is oftener met.