The conquest of all Persia followed, and the Moslem Empire pushed far into Western Turkestan and eastward until it met the Chinese. Egypt fell almost without resistance to the new conquerors, who full of a fanatical belief in the sufficiency of the Koran, wiped out the vestiges of the book-copying industry of the Alexandria Library. The tide of conquest poured along the north coast of Africa to the Straits of Gibraltar and Spain. Spain was invaded in 710 and the Pyrenees Mountains were reached in 720. In 732 the Arab advance had reached the centre of France, but here it was stopped for good at the battle of Poitiers and thrust back as far as the Pyrenees again. The conquest of Egypt had given the Moslim a fleet, and for a time it looked as though they would take Constantinople. They made repeated sea attacks between 672 and 718 but the great city held out against them. Map: The Growth of the Moslem Power in 25 Years Map: The Moslem Empire, 750 A.D. The Arabs had little political aptitude and no political experience, and this great empire with its capital now at Damascus, which stretched from Spain to China, was destined to break up very speedily. From the very beginning doctrinal differences undermined its unity. But our interest here lies not with the story of its political disintegration but with its effect upon the human mind and upon the general destinies of our race. The Arab intelligence had been flung across the world even more swiftly and dramatically than had the Greek a thousand years before. The intellectual stimulation of the whole world west of China, the break-up of old ideas and development of new ones, was enormous. In Persia this fresh excited Arabic mind came into contact not only with Manichæan, Zoroastrian and Christian doctrine, but with the scientific Greek literature, preserved not only in Greek but in Syrian translations. It found Greek learning in Egypt also. Every-where, and particularly in Spain, it discovered an active Jewish tradition of speculation and discussion. In Central Asia it met Buddhism and the material achievements of Chinese civilization. It learnt the manufacture of paper—which made printed books possible—from the Chinese. And finally it came into touch with Indian mathematics and philosophy. JERUSALEM, SHOWING THE MOSQUE OF OMAR JERUSALEM, SHOWING THE MOSQUE OF OMAR _Photo: Lehnert & Landrock_