A race has roots. Race and landscape belong together. Where a plant takes root, there it dies also. There is certainly a sense in which we can, without absurdity, work backwards from a race to its “home,” but it is much more important to realize that the race adheres permanently to this home with some of its most essential characters of body and soul. If in that home the race cannot now be found, this means that the race has ceased to exist. A race does not migrate. Men migrate, and their successive generations are born in ever-changing landscapes; but the landscape exercises a secret force upon the plant-nature in them, and eventually the race-expression is completely transformed by the extinction of the old and the appearance of a new one. Englishmen and Germans did not migrate to America, but human beings migrated thither _as_ Englishmen and Germans, and their descendants are there _as_ Americans. It has long been obvious that the soil of the Indians has made its mark upon them--generation by generation they become more and more like the people they eradicated. Gould and Baxter have shown that Whites of all races, Indians, and Negroes have come to the same average in size of body and time of maturity--and that so rapidly that Irish immigrants, arriving young and developing very slowly, come under this power of the landscape within the same generation. Boas has shown that the American-born children of long-headed Sicilian and short-headed German Jews at once conform to the same head-type. This is not a special case, but a general phenomenon, and it should serve to make us very cautious in dealing with those migrations of history about which we know nothing more than some names of vagrant tribes and relics of languages (e.g., Danai, Etruscans, Pelasgi, Achæans, and Dorians). As to the race of these “peoples” we can conclude nothing whatever. That which flowed into the lands of southern Europe under the diverse names of Goths, Lombards, and Vandals was without doubt a race in itself. But already by Renaissance times it had completely grown itself into the root characters of the Provençal, Castilian, and Tuscan soil.