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Primitive tendency to belief in magic The Greek conception of natural laws Influence of Plato and Aristotle on the growth of science Effect of the establishment of Christianity on the development of the physical sciences The revival of thought in the twelfth and thirteenth centuries Albert the Great Vincent of Beauvais Thomas Aquinas Roger Bacon's beginning of the experimental method brought to nought The belief that science is futile gives place to the belief that it is dangerous The two kinds of magic Rarity of persecution for magic before the Christian era The Christian theory of devils Constantine's laws against magic Increasing terror of magic and witchcraft Papal enactments against them Persistence of the belief in magic Its effect on the development of science Roger Bacon Opposition of secular rulers to science John Baptist Porta The opposition to scientific societies in Italy In England The effort to turn all thought from science to religion