The undulatory theory of light also assumes the existence of a medium.
2.
This, along with " Discours du mouvement local " ( Paris, 1670 ), and the manuscript " Trait?complet d'Optique ", in which he followed the undulatory theory of light ( which identifies it as a harmonic vibration ), form part of a general work on physics which he had planned . " Trait?complet d'Optique " had been studied by Pierre Ango ( 1640-1694 ) a confrere of Pardies for his Book " L ` Optique " which he published in 1682 after Pardies early death.
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