He seems to have shown signs of being unhappy with Descartes ' theory around this time but he still addressed the Académie on this topic in 1669 although after his address Roberval and Mariotte argued strongly, and correctly, against Descartes' theory and this may have influenced Huygens.
Ta tundub olevat näidanud märke sellest, et rahul Descartes'i teooria Umbes samal ajal, kuid ta veel tegeleda Académie sellel teemal 1669 kuigi pärast tema aadress Roberval ja Mariotte toonitas, ja õigesti, vastu Descartes'i teooria ja see võis mõjutada Huygens .