[148] Philos. princ. mathem. Lib. II. prop. 2. & schol.

[149] Ibid. prop 53.

[150] Philos. princ. prop. 52. coroll. 4.

[151] Ibid.

[152] Coroll. 11.

[153] See ibid. schol. post prop. 53.

[154] Princ. philos. pag. 316, 317.

[155] Ch. I. § 7.

[156] Book I. Ch. 3.

[157] Book I. Ch. 3. § 29.