[66] social conditions of the Greek and Roman world. And we may suspect that the social conditions of the Middle Ages would have proved unfavourable to the scientific spirit— the disinterested quest of facts—even if the controlling beliefs had not been hostile. We may suspect that the rebirth of science would in any case have been postponed till new social conditions, which began to appear in the thirteenth century (see next Chapter), had reached a certain maturity. Theological prejudice may have injured knowledge principally by its survival after the Middle Ages had passed away. In other words, the harm done by Christian doctrines, in this respect, may lie less in the obscurantism of the dark interval between ancient and modern civilization, than in the obstructions which they offered when science had revived in spite of them and could no longer be crushed. The firm belief in witchcraft, magic, and demons was inherited by the Middle Ages from antiquity, but it became far more lurid and made the world terrible. Men believed that they were surrounded by fiends watching for every opportunity to harm them, that pestilences, storms, eclipses, and famines were the work of the Devil; but they believed as firmly that ecclesiastical rites were capable of coping with these enemies. Some of the [67] early Christian Emperors legislated against magic, but till the fourteenth century there was no systematic attempt to root out witchcraft. The fearful epidemic, known as the Black Death, which devastated Europe in that century, seems to have aggravated the haunting terror of the invisible world of demons. Trials for witchcraft multiplied, and for three hundred years the discovery of witchcraft and the destruction of those who were accused of practising it, chiefly women, was a standing feature of European civilization. Both the theory and the persecution were supported by Holy Scripture. “Thou shalt not suffer a witch to live” was the clear injunction of the highest authority. Pope Innocent VIII issued a Bull on the matter (1484) in which he asserted that plagues and storms are the work of witches, and the ablest minds believed in the reality of their devilish powers. No story is more painful than the persecution of witches, and nowhere was it more atrocious than in England and Scotland. I mention it because it was the direct result of theological doctrines, and because, as we shall see, it was rationalism which brought the long chapter of horrors to an end. In the period, then, in which the Church exercised its greatest influence, reason was