[141.] Demonstration.
[142.] Method III.
[143.] CHAP. VI.
[144.] Prob. I.
[145.] Prob. II.
[146.] Demonstration.
[147.] Corollary.
[148.] Method II.
[149.] Operation,
[150.] Demonstration.
[151.] Remarks.
[152.] Method III.
[153.] Operation.
[154.] Demonstration.
[155.] H I: T H:: a X: a T.
[156.] Prob. III.
[157.] Operation.
[158.] Demonstration.
[159.] Prob. IV.
[160.] Method II.
[161.] Operation.
[162.] Method III.
[163.] Remarks.
[164.] CHAP. VII. Of Shadows.
[165.] Of Solar Shadows. Problem I.
[166.] Operation.
[167.] Proe. II.
[168.] Remarks.
[169.] Problem III.
[170.] Of the Shadows of a ſmall Light. Prob. IV.