Mr. Newtons answer to the foregoing letter further explaining his theory of light and colors, and particularly that of whiteness; together with his continued hopes of perfecting telescopes by reflections rather than refractions.

Concerning the business of Colors; in my saying that when Monsieur N. hath shewn how <italic>White</italic> may be produced our of two uncompounded colors, I will tell him, why he can conclude nothing from <italic>that</italic>; my meaning was, that such a White, (were there any such,) would have different properties from the White, which I had respect to