[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.

[171.] Problem V.

[172.] Remarks.

[173.] CHAP. VIII. Of mechanically ſhortning the Operations of Perſpective. 1. WHEN the perſpective Plane is ſup-pos’d perpendicular or upright. Problem I.

[174.] Operation.

[175.] Method II.

[176.] Prob. II.

[177.] Operation.

[178.] Method II.

[179.] Method III.

[180.] The Demonſtration of the two laſt Ways.