We have endeavored in this brief treatise to trace the development of man from his primeval state as a tree-dwelling animal in the depths of the tropic woods, through the phases of his later condition as an erect surface dweller, his conflict with and dominion over the animal kingdom, his subsequent contest with the adverse powers of nature, and his final warfare with his fellows and emergence into civilization. Each of these contests has left its results; the first in the forest nomads of the eastern tropics, the second in the patriarchal herding tribes of the steppes and deserts, the village communities of Russia and the paternal empire of China, the third in the enlightened nations of Europe and America. For how long a period this mighty drama of evolution has continued it is impossible to say. Its first phase must have been of interminable slowness; its second, while more rapid, still very deliberate; its third of much greater rapidity, yet extending over several thousands of years. Millions of years have probably passed away since it began, yet the period involved is none too long for the magnitude of the results, whose greatness can be seen if we contrast man's mental development with that of the lower animals during this period. Physically, the development of man has been inconsiderable--much less apparently than that of many other animals. Mentally, it has been enormous. The whole of nature's influences, in new and often adverse situations, have been brought to bear upon man's mind, and as the result we have civilized man as contrasted with the anthropoid ape. And the end is not yet. The era of war in man's development is near its close, and a new era of peace, under conditions of advanced mental and physical activity, seems about to begin. Its outcome no man can predict, but it may far surpass in beneficial results all that has gone before, and carry man upward to an extraordinarily elevated mental plane. XII THE EVOLUTION OF MORALITY