Mecklin, John M., Democracy and Race Friction, a Study in Social Ethics, New York, 1914. p. 147.

It would be more accurate to say the Nordic race. Other white races have not uniformly shown this discrimination. The Mediterranean race in particular has never manifested the same amount of race feeling. The Arabs have tended to receive the Negro almost on terms of equality, partly on religious grounds; it seems probable that the decadence of the Arabs is largely due to their miscegenation.

Mecklin, op. cit., p. 147.