TY - JOUR T1 - Extracts of Two Letters, the One of Mr. Newton, Concerning the Number of Colors, and the Necessity of Mixing Them All for the Production of White, &c; the Other, of a Philosopher at Paris, by Way of Answer to the Former JF - Philosophical Transactions (1665-1678) VL - 8 SP - 6108 EP - 6112 PY - 1753/01/01/ UR - http://dx.doi.org/10.1098/rstl.1673.0041 M3 - doi:10.1098/rstl.1673.0041 AU - Newton, I. ER -