The Description of the Human Body He believed the heat of the heart somehow caused all movement of the body. Blood vessels he realized were pipes, he saw that veins carried digested food to the heart. (This was brought further by William Harvey. Harvey developed the idea of the circulation of the blood.) Descartes felt that an energetic part of blood went to the brain and there gave the brain a special type of air imbued with vital force that enabled the brain to experience, think and imagine. This special air then went through the nerves to the muscles enabling them to move. The Description of
James VI and I witches and wrote "Daemonologie" in 1597, a tract inspired by his personal involvement that opposed the practice of witchcraft and that provided background material for Shakespeare's "Tragedy of Macbeth". James personally supervised the torture of women accused of being witches. After 1599, his views became more sceptical. In a later letter written in England to his son Henry, James congratulates the prince on "the discovery of yon little counterfeit wench. I pray God ye may be my heir in such discoveries ... most miracles now-a-days prove but illusions, and ye may see by this how wary judges should be in