"It was a comparatively simple evolutionary step to regard these principles or "elements" as mutually convertible. Anaximenes' theory of the formation of rain was an implicit admission of such convertibility. This philosopher taught that rain came by the condensation of clouds, which in their turn were formed by the condensation of air. Everything comes from air, and everything returns to air. That water might be converted by fire into air was surmised from the earliest times."
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History of Chemistry (Thorpe)
History of Chemistry by Sir was written in 2 volumes: Vol. I. From the Earliest Times to the Middle of the Nineteenth Century (1909); and Vol. II. From 1850 to 1910 (1910).
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