CHAPTER XII
NEWTON AND THE LAW OF GRAVITATION
(1) (p. 242). Sir Isaac Newton, Principia, translated by Andrew Motte, New York, 1848, pp. 391, 392.
(2) (p. 250). Newton op. cit., pp. 506, 507.
4NV206o/AaSsUNoklE8uYSBUCiu6s0B3xcdT4XQ/jJXEs3nsK5Y5PfYB5QmQao5X