The reader will note a general similarity in the history of all these civilizations in spite of the effectual separation caused by the great barriers of the Indian north-west frontier and of the mountain masses of Central Asia and further India. First for thousands of years the heliolithic culture spread over all the warm and fertile river valleys of the old world and developed a temple system and priest rulers about its sacrificial traditions. Apparently its first makers were always those brunette peoples we have spoken of as the central race of mankind. Then the nomads came in from the regions of seasonal grass and seasonal migrations and superposed their own characteristics and often their own language on the primitive civilization. They subjugated and stimulated it, and were stimulated to fresh developments and made it here one thing and here another. In Mesopotamia it was the Elamite and then the Semite, and at last the Nordic Medes and Persians and the Greeks who supplied the ferment; over the region of the Ægean peoples it was the Greeks; in India it was the Aryan-speakers; in Egypt there was a thinner infusion of conquerors into a more intensely saturated priestly civilization; in China, the Hun conquered and was absorbed and was followed by fresh Huns. China was Mongolized just as Greece and North India were Aryanized and Mesopotamia Semitized and Aryanized. Everywhere the nomads destroyed much, but everywhere they brought in a new spirit of free enquiry and moral innovation. They questioned the beliefs of immemorial ages. They let daylight into the temples. They set up kings who were neither priests nor gods but mere leaders among their captains and companions. THE DYING GAUL THE DYING GAUL The statue in the National Museum, Rome, depicting a Gaul stabbing himself, after killing his wife, in the presence of his enemies _Photo: Anderson_ In the centuries following the sixth century B.C. we find everywhere a great breaking down of ancient traditions and a new spirit of moral and intellectual enquiry awake, a spirit never more to be altogether stilled in the great progressive movement of mankind. We find reading and writing becoming common and accessible accomplishments among the ruling and prosperous minority; they were no longer the jealously guarded secret of the priests. Travel is increasing and transport growing easier by reason of horses and roads. A new and easy device to facilitate trade has been found in coined money. Let us now transfer our attention back from China in the extreme east of the old world to the western half of the Mediterranean. Here we have to note the appearance of a city which was destined to play at last a very great part indeed in human affairs, Rome.