Next came the housing problem. This was simple. Many animals were in the habit of sleeping in dark caves. Man now followed their example, drove the animals out of their warm homes and claimed them for his own. Even so, the climate was too severe for most people and the old and the young died at a terrible rate. Then a genius bethought himself of the use of fire. Once, while out hunting, he had been caught in a forest-fire. He remembered that he had been almost roasted to death by the flames. Thus far fire had been an enemy. Now it became a friend. A dead tree was dragged into the cave and lighted by means of smouldering branches from a burning wood. This turned the cave into a cozy little room. [Illustration: PREHISTORIC EUROPE] And then one evening a dead chicken fell into the fire. It was not rescued until it had been well roasted. Man discovered that meat tasted better when cooked and he then and there discarded one of the old habits which he had shared with the other animals and began to prepare his food. In this way thousands of years passed. Only the people with the cleverest brains survived. They had to struggle day and night against cold and hunger. They were forced to invent tools. They learned how to sharpen stones into axes and how to make hammers. They were obliged to put up large stores of food for the endless days of the winter and they found that clay could be made into bowls and jars and hardened in the rays of the sun. And so the glacial period, which had threatened to destroy the human race, became its greatest teacher because it forced man to use his brain. HIEROGLYPHICS THE EGYPTIANS INVENT THE ART OF WRITING AND THE RECORD OF HISTORY BEGINS These earliest ancestors of ours who lived in the great European wilderness were rapidly learning many new things. It is safe to say that in due course of time they would have given up the ways of savages and would have developed a civilisation of their own. But suddenly there came an end to their isolation. They were discovered. A traveller from an unknown southland who had dared to cross the sea and the high mountain passes had found his way to the wild people of the European continent. He came from Africa. His home was in Egypt. The valley of the Nile had developed a high stage of civilisation thousands of years before the people of the west had dreamed of the possibilities of a fork or a wheel or a house. And we shall therefore leave our great-great-grandfathers in their caves, while we visit the southern and eastern shores of the Mediterranean, where stood the earliest school of the human race.