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| | Science Timeline |
 | | In 1661, Robert Boyle, in the Sceptical Chymist, separated chemistry as corpuscles, from alchemy, as qualities, and gave the first precise definitions of a chemical element, a chemical reaction, chemical analysis, and made studies of acids and bases. |
 | | In 1678, Huygens, in a communication to the Academie des Science, propounded a wave theory of light propagated through 'aether,' and held that every point on a wave is itself a source of new waves. |
 | | Thus the connections which science establishes are "entirely arbitrary," and the "utmost effort of human reason is to reduce the principles, productive of natural phenomena, to a greater simplicity" (Hume 1738:30). |
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