AS AN earnest and respectable science is often said to date from 1661, whenRobert Boyle of Oxford published The Sceptical Chymist —the first work to distinguishbetween chemists and alchemists—but it was a slow and often erratic transition. Into theeighteenth century scholars could feel oddly comfortable in both camps—like the GermanJohann Becher, who produced an unexceptionable work on mineralogy called PhysicaSubterranea , but who also was certain that, given the right materials, he could make himselfinvisible.

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