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| | Science Timeline |
 | | 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. |
 | | In 1717, Jean Bernoulli propounded the 'Principle of Virtual Displacements: "Any time there is a state of equilibrium of given forces..., then, the sum of the positive energies will be equal to the sum of the negative energies taken positively" (Bernoulli, quoted in Duhem 1905:432). |
 | | 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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