In drawing inferences from social distinctions, the same point of view is frequently held. It is assumed, that, as the mental development of the white race is the highest, it also has the highest aptitude in this direction, and therefore its mind is supposed to have the most subtile organization. As the ultimate psychical causes are not so apparent as anatomical characteristics, the judgment of the mental status of a people is generally guided by the difference between its social status and our own: the greater the difference between their intellectual, emotional, and moral processes and those which are found in our civilization, the harsher the judgment on the people. It is only when a Tacitus finds the virtues of past stages of the life of his own people among foreign tribes that their example is held up to the gaze of his fellow-citizens, who probably had a pitying smile for the dreamer who clung to the ideas of a time which they had left far behind. In order to understand clearly the relations between race and civilization, the two unproved assumptions to which I have referred must be subjected to a searching analysis. We must investigate in how far we are justified in assuming that achievement is primarily due to exceptional aptitude, and in how far we are justified in assuming that the European type—or, taking the notion in its extreme form, that the North European type—represents the highest development of mankind. It will be advantageous to clear up these points before we take up the detailed inquiry. In regard to the former point, it might be said, that, although achievement is not necessarily a measure of aptitude, it seems admissible to judge the one by the other. Have not most races had the same chances for development? Why, then, did the white race alone develop a civilization which is sweeping the whole world, and compared to which all other civilizations appear as feeble beginnings cut short in early childhood, or arrested and petrified in an early stage of development? Is it not, to say the least, probable that the race which attained the highest stage of civilization was the most gifted one, and that those races which remained at the bottom of the scale were not capable of rising to higher levels?