774 



POPULAR SCIENCE MONTHLY. 



rule would obtain south of the Alps. If this relation does not 

 hold, there must obviously be something environmentally the 

 matter. Let us examine the facts. 



The Black Forest in southwestern Germany affords us a good 

 opportunity for the comparison of relatively pure and mixed 



Pure Blond Teutonic Type. Cephalic Index, 75. 



populations. This mountainous, heavily wooded district, shown 

 in our map, lies close by the upper courses of the two principal 

 rivers of Europe, which have both formed great channels of racial 

 migration. The Rhine encircles it on the west and south, and an 

 important affluent of the same river bounds it on the east ; for 

 the Neckar drains the fertile plains of Wurtemberg, or Swabia, 

 which lie about Stuttgart. This capital city, it should be ob- 

 served, lies not far from the point of that blond Teutonic wedge 

 which, we have already shown, penetrates central Europe from 

 the north. Finally, the Danube, not shown upon the map, takes 

 its source in the southeastern part of the Forest, and has there- 

 fore opened up still another route of racial immigration from this 

 quarter. 



There is every evidence that here in the Black Forest is a 

 mountainous area of isolation containing a people which is dis- 

 tinctly Alpine in type of head form as compared with the mixed 

 populations of the fertile plains and valleys round about it. For 

 example, the cephalic index in Wolfach in its center is above 

 86, three units and more above the average for the Rhine Val- 



