79:2.7

Race mixture is always advantageous in that it favors versatility of culture and makes for a progressive civilization, but if the inferior elements of racial stocks predominate, such achievements will be short-lived. A polyglot culture can be preserved only if the superior stocks reproduce themselves in a safe margin over the inferior. Unrestrained multiplication of inferiors, with decreasing reproduction of superiors, is unfailingly suicidal of cultural civilization.