[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.