[108] Lib. I. sect. 10.

[109] De la Pesanteur, pag. 169, and the following.

[110] Newton. Princ. L. II. prop 4. schol.

[111] See his Tract on the admirable rarifaction of the air.

[112] Book II. Ch. 6.

[113] Princ. philos. Lib. II. prop. 23.

[114] Book I. Ch. 2. § 30.

[115] Princ. philos. Lib. II. prop. 23, in schol.

[116] Princ. philos. Lib. II. prop. 33. coroll.

[117] Lib. II. Ch. 5.