What Des-Cartes did was a good step. You have added much several ways, & especially in taking the colours of thin plates into philosophical consideration. If I have seen further it is by standing on the sholders of Giants.

Isaac Newton (1642-1727) English physicist and mathematician

Letter to Robert Hooke (5 Feb 1676)

In the Gregorian calendar, 15 Feb 1676.See Bernard of Chartres.