All this helped to make Egypt wealthy, and gave it great political importance, so that very early in the world's history it enjoyed a greater prosperity and a higher civilization than any of its neighbours. Learned men from all countries were drawn to it in search of fresh knowledge, for nowhere else were there such seats of learning as in the Nile cities, and it is acknowledged that the highly trained priesthood of the Pharaohs practised arts and sciences of which we in these days are ignorant, and have failed to discover. In 30 B.C. the last of the Pharaohs disappeared, and for 400 years the Romans ruled in Egypt, many of their emperors restoring the ancient temples as well as building new ones; but all the Roman remains in Egypt are poor in comparison with the real Egyptian art, and, excepting for a few small temples, little now remains of their buildings but the heaps of rubbish which surround the magnificent monuments of Egypt's great period. During the Roman occupation Christianity became the recognized religion of the country, and to-day the Copts (who are the real descendants of the ancient Egyptians) still preserve the primitive faith of those early times, and, with the Abyssinians, are perhaps the oldest Christian church now existing. The greatest change in the history of Egypt, however, and the one that has left the most permanent effect upon it, was the Mohammedan invasion in A.D. 640, and I must tell you something about this, because to the great majority of people who visit Egypt the two great points of interest are its historical remains and the beautiful art of the Mohammedans. The times of the Pharaohs are in the past, and have the added interest of association with the Bible; this period of antiquity is a special study for the historian and the few who are able to decipher hieroglyphic writing, but the Mohammedan era, though commencing nearly 200 years before Egbert was crowned first King of England, continues to the present day, and the beautiful mosques, as their churches are called (many of which were built long before there were any churches in our own country), are still used by the Moslems. Nothing in history is so remarkable as the sudden rise to power of the followers of Mohammed. An ill-taught, half-savage people, coming from an unknown part of Arabia, in a very few years they had become masters of Syria, Asia Minor, Persia, and Egypt, and presently extended their religion all through North Africa, and even conquered the southern half of Spain, and to-day the Faith of Islam, as their religion is called, is the third largest in the world.