This is a fascinating book and a must read for scientists. Francis Bacon had a colorful life as a diplomat, coutier, religious philosopher, but is most noted as the father of modern experimental science. This book is so important because is puts that latter role into sharp, clear, historical context. Bacon was not a modern scientist, nor were his beliefs modern; they were a product of his time. Bacon never made any scientific discoveries or formulated any particular laws, like a Newton or Galileo, but he was the main Western architect of the METHOD, using experiments in the world to inform “natural Philosophy”. The main influence for this notion was the practice in the early modern period was magic. Natural philosophy of the time was a lot of Aristotelian speculation and hot air. Magic was predicated on the idea that elements of God’s natural world had inherent sympathies and antipathies with one another and their proper correspondences along the Great Chain of Being led to natural changes. (In a sense this is not far off from what we think today when we say, for example, that methane has an affinity for oxygen and changes to carbon dioxide.) Bacon felt the experimental nature of magic could reveal the true nature of the cosmos and worked to bring a systematic, orderly practice of experiment from magic into the world of natural philosophy -- in essence to create the scientific method. (The Arab scientist al Hakim had the same idea hundreds of years earlier, but there you go.) The author, Henry, is at pains to show that these older magical ideas might be wrong, but they are not totally irrational. They followed logically from the thinking and beliefs of the time, which was steeped to the brim in religion from which a mind could barely escape. The job of the magician was to find the hidden correspondences and sympathies so the information could be used to affect change, Bacon hoped, for the improvement of mankind. The magician could not make changes, only find the way God had designed things and make use of that. Henry makes some interesting points about these 16th century magicians and the idea they might be agents of the devil. At this time it was not thought the devil had supernatural powers, he was an inferior creature and could not break God’s laws he only had a deep knowledge of the natural affinities. A magician might summon a devil to take a short cut through the arduous path of discovery and was thereby in danger of losing his soul, but he could not summon supernatural power. This notion of summoning the dark forces which had supernatural power, was a LATER idea, say 17th and 18th century and continues into modern horror movies. An important aspect of this marvelous book is to show the depth of religious influence on all forms of thought. He points out that if you were taught from day one that the words of the priest could change water and bread into the body and blood of Christ then why couldn’t the words of a magician affect changes in the world. Words could bring about “correspondences”. Today we think of modern science as totally secular and at odds with any taint of the supernatural, but it was a hard slog to break from those ancient habits. Newton, for example, never really did! Bacon felt that acquiring knowledge, reclaiming the Adamic knowledge lost in the fall, was a requisite for the end of days, which was a big millennial topic in his time. Bacon’s model for the aquisiotion of knowledge entailed the objective accumulation of facts without an underlying philosophy to color those facts. This model was never really used by practicing scientists, but the role of objectivity is still a goal and foundation of modern science. One can argue that Bacon was not all he is often cracked up to be by modern standards, but he is widely accepted as the figurehead around which nonsectarian, non religious science is centered – we need to mark history with key figures and he is one.