Note 1615 — XVII THE EVOLUTION OF PHYSICAL CHARACTERS

Dublin and Baker, Amer. Stat. Soc., vol. xvii, 1920. Nevertheless, as shown by an important memoir by Hrdlicka, a new variety is not being produced, at least with any rapidity, under the influence of the American environment. Hrdlicka studied representatives of the old white American stock, whose ancestors had been for four generations in the United States, and concluded that no new sub-type has yet emerged. In fact the faithful preservation of the traits of the original immigrants is the outstanding result of the study.