[268] Chap. 3. § 18.

[269] Newt. Princ. philos. Lib. I. prop. 66. coroll. 18.

[270] § 8.

[271] Ch. 3. § 5.

[272] Ch. 3 § 17.

[273] Ibid.

[274] See below § 44.

[275] Newton Princ. Lib. III. prop. 19.

[276] Lib. III. prop. 19.

[277] Lib. I. prop. 73.