[65] and Luther in the same way attributed them to Satan. It was only logical that supernatural remedies should be sought to counteract the effects of supernatural causes. There was an immense traffic in relics with miraculous virtues, and this had the advantage of bringing in a large revenue to the Church. Physicians were often exposed to suspicions of sorcery and unbelief. Anatomy was forbidden, partly perhaps on account of the doctrine of the resurrection of the body. The opposition of ecclesiastics to inoculation in the eighteenth century was a survival of the mediaeval view of disease. Chemistry (alchemy) was considered a diabolical art and in 1317 was condemned by the Pope. The long imprisonment of Roger Bacon (thirteenth century) who, while he professed zeal for orthodoxy, had an inconvenient instinct for scientific research, illustrates the mediaeval distrust of science.
It is possible that the knowledge of nature would have progressed little, even if this distrust of science on theological grounds had not prevailed. For Greek science had ceased to advance five hundred years before Christianity became powerful. After about 200 B.C. no important discoveries were made. The explanation of this decay is not easy, but we may be sure that it is to be sought in the
[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 factseven 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