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The History and Present State of Electricity with Original Experiments, first published in 1767, not only included Priestley’s analysis of the experiments, discoveries, and inventions of others but also discussed some of his own experiments for example, his discovery that charcoal conducted electricity. The most important period for Priestley’s contributions to science and invention began in 1767, when he moved from Warrington to Leeds. Here he became minister at Mill Hill Chapel and made two of his most important discoveries. The first was carbonated water, which was the result of his experiments at a brewery. The second occurred when, in 1770, he was working on a popularization of his history of electricity. He discovered that the hardened sap from certain trees in Brazil and India was able to rub out lead pencil marks. He published his observations on what he called a rubber.