AS AN ear and respectable sce is often said to date from 1661, whe Boyle of Oxford published The Sceptical Chymist —the first work to distinguishbetwees and alchemists—but it was a slow and ofteic transition. Into theeighteenth tury scholars could feel oddly fortable in both camps—like the GermanJohann Becher, who produced an uionable work on mineralogy called PhysicaSubterranea , but who also was certain that, given the right materials, he could make himselfinvisible.
Perhaps nothier typifies the strange and often actal nature of chemical s its early days than a discovery made by a German named Hennig Brand in 1675. Brandbecame vihat gold could somehow be distilled from human urihe similarity ofcolor seems to have been a factor in his clusion.) He assembled fifty buckets of humanurine, which he kept for months in his cellar. By various redite processes, he verted theurine first into a noxious paste and then into a translut waxy substanone of it yiel……（内容加载失败！）
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