It may happen that in the course of its history such a people will come into contact a second time, and even oftener, with the original founders of their culture and may not even remember that distant association. Instinctively the remnants of blood left from that old ruling race will be drawn towards this new phenomenon and what had formerly been possible only under compulsion can now be successfully achieved in a voluntary way. A new cultural wave flows in and lasts until the blood of its standard-bearers becomes once again adulterated by intermixture with the originally conquered race.