A deeper and more thorough-going unity is required in a community made up of highly differentiated peoples than in a more settled and stratified one, and it may be logical that we should find in this commingling of many peoples a certain balance and concord of opposing and contending forces; a gravitation toward the universal. Because of their difference in all external matters, in all of the non-essentials of life, the people in a cosmopolitan city are forced to found their community of interests upon the basic and essential likenesses of their common human nature; for, after all, the things that make men alike are stronger and more primitive than the things that separate them. It is natural that this synthesis of the varying nations should be made first at the points of the greatest congestion, quite as we find that selfishness is first curbed and social feeling created at the points where the conflict of individual interests is sharpest. One dares not grow too certain as to the wells of moral healing which lie under the surface of the sullen work-driven life which the industrial quarters of the modern city present. They fascinate us by their mere size and diversity, as does the city itself; but certain it is, that these quarters continually confound us by their manifestations of altruism. It may be that we are surprised simply because we fail to comprehend that the individual, under such pressure, must shape his life with some reference to the demands of social justice, not only to avoid crushing the little folk about him, but in order to save himself from death by crushing. It is an instance of the irresistible coalescing of the altruistic and egoistic impulse which is the strength of social morality. We are often told that men under this pressure of life become calloused and cynical, whereas anyone who lives with them knows that they are sentimental and compassionate.