The interval of prosperity was, however, brief; no permanent addition was made to the stock of precious metals, and prices continued to fall, as is demonstrated by the rapid deterioration of the currency. In this second period of relapse disintegration reached its limit. During the tenth and eleventh centuries the Northmen infested the coasts of France, and sailed up the rivers burning and ravaging, as far as Rouen and Orléans. Even the convents of Saint Martin of Tours and Saint Germain des Près were sacked. The Mediterranean swarmed with Saracenic corsairs, who took Fraxinetum, near Toulon, seized the passes of the Alps, and levied toll on travel into Italy. The cannibalistic Huns overran the Lower Danube, and closed the road to Constantinople. Western Europe was cut off from the rest of the world. Commerce nearly ceased--the roads were so bad and dangerous, and the sea so full of pirates. The ancient stock of scientific knowledge was gradually forgotten, and the imagination had full play. Upon philosophy the effect was decisive; Christianity sank to a plane where it appealed more vividly to the minds of the surrounding pagans than their own faiths, and conversion then went on rapidly. In 912 Rollo of Normandy was baptized; the Danes, Norwegians, Poles, and Russians followed; and in 997 Saint Stephen ascended the throne of Hungary and reopened to Latin Christians the way to the Sepulchre. Perhaps the destiny of modern Europe has hinged upon the fact that the Christian sacred places lay in Asia, and therefore the pilgrimage brought the West into contact with the East. But the pilgrimage was the effect of relic-worship, and relic-worship the vital principle of monasticism. In these centuries of extreme credulity monasticism had its strongest growth. A faculty for scientific study was abnormal, and experimental knowledge was ascribed to sorcery. The monk Gerbert, who became pope as Sylvester II., was probably the most remarkable man of his generation. Though poor and of humble birth, he attracted so much attention that he was sent to Spain, where he studied in the Moorish schools at Barcelona and Cordova, and where he learned the rudiments of mathematics and geography. His contemporaries were so bewildered by his knowledge that they thought it due to magic, and told how he had been seen flying home from Spain, borne on the back of the demon he served, and loaded with the books he had stolen from the wizard, his master. Sylvester died in 1003, but long afterwards anatomy was still condemned by the Church, and four separate councils anathematized experimental medicine, because it threatened to destroy the value of the shrines. The ascendency of Cluny began with Saint Hugh, who was chosen abbot in 1049, the Year Leo’s election. The corporation then obtained control of Rome, and in another twenty-five years was engaged in its desperate struggle with the remains of the old secular police power. But though