December, January, and February is because these climatic conditions are absent during these three months. Again, men are differentiated into races, thrive, develop, and reach and maintain mental and physical perfection within well defined climatic areas. Nature preserves the race that has acquired through countless ages acclimatization in a given environment, and kills off very quickly immigrants coming from far north or south of the given latitudes. The natural geographical position for the black man is from the equator to the thirtieth parallel of north or south latitude. The thirtieth parallel in America runs through upper Florida, southern Louisiana, and the lowest third of Texas. From the thirtieth to the thirty-fifth parallel is the zone of the brown man, like the Malay. The thirty-fifth parallel runs along the southern border of North Carolina and Tennessee, through the middle of Arkansas, New Mexico, Arizona, and the lowest third of California. From the thirty-fifth to the forty-fifth parallel is the zone of the brune Mediterranean races. The forty-fifth parallel passes near Halifax, Bangor in Maine, Ogdensburg, Ottawa, and St. Paul. In Europe it runs near Bordeaux, Turin, Bosnia, and the Crimea. New York is as far south as Naples, Philadelphia is sixty miles south of Naples, and has the sun of southern Italy. The Nordic races that we are interested in as our origins all live above the United States, and the summer temperatures they have been accustomed to are above the United States. An immigrant coming from northern Ireland to Philadelphia moves southward a thousand miles; a Norwegian going to Texas moves southward two thousand miles, and his family disappears as a rule in two generations. In historic times there have been sudden movements southward of European races for about seven hundred miles and all ended disastrously. The Lombards went south from upper Prussia to middle Italy at the level of Boston and disappeared in two hundred years. The Teutonic Goths went from the Baltic to Italy and Spain. They lasted sixty-two years in Italy. Eighty thousand Vandals with their families went down from Brandenburg to North Africa at the level of Virginia. They were annihilated by the climate in one hundred and eight years. The Burgundians disappeared in sixty years from Greece, as the Celts who had carried the Homeric sagas to Greece also disappeared. Rome was great while the Nordic Cisalpine Celt ruled it, and died forever with the Celt. Italian art ended at Florence, the southern boundary of Cisalpine Gaul. The Slav disappeared the same way from southeastern Europe and left only language traces to the Turanian and Semite there. No European race of pure blood has ever had grandchildren in the tropics.