Because we are without this knowledge, we cannot read aright the past or present history of civilization. Modern crimes of injustice toward weaker peoples have been made easy by this suppression of truth. It has been popular and remunerative to write and speak on the side of prejudice. A better spirit is rising in the world. Men are eager for information, for the truth. Through the teaching of sociology, the most popular and crowded classes of our great universities, in a scientific way, man is beginning to see the need of a realization of our common brotherhood and to reach out to solve unmastered problems and unfulfilled duties.