[61.] Example III. 48. To throw a circle into Perſpective.

[62.] Remarks.

[63.] Prob. V. 50. To find the Repreſentation of a Point, elevated above the Geometrical Planc.

[64.] Operation.

[65.] Demonstration.

[66.] Prob. VI. 52. To throm a Pyramid, or Cone, into Perſpective.

[67.] 53. To determine the viſible Part of the Baſe of a Cone.

[68.] Operation.

[69.] Demonstration.

[70.] Remarks.

[71.] Problem VII. 55. To find the Perſpective of a Line, perpendicular to the Geometrical Plane.

[72.] Operation.

[73.] Demonstration.

[74.] Method II.

[75.] Demonstration.

[76.] Method III.

[77.] Operation, Without Compaſſes.

[78.] Demonstration.

[79.] Scholium.

[80.] Corollary.

[81.] Problem VIII.

[82.] To do this another Way.

[83.] Demonstration.

[84.] Problem IX.

[85.] Problem X.

[86.] Demonstration.

[87.] EG: EN:: GY: NM.

[88.] Definition.

[89.] Problem XI.

[90.] Lemma.