[651.] PROPOSITION V. Theoreme.

[652.] Demonstration.

[653.] Corollaire.

[654.] Definition.

[655.] PROPOSITION VI. Theoreme.

[656.] Demonstration.

[657.] Définitions. I.

[658.] II.

[659.] Corollaire.

[660.] PROPOSITION VII. Théoreme.

[661.] Demonstration.

[662.] Corollaire I.

[663.] Corollaire II.

[664.] Corollaire III.

[665.] PROPOSITION VIII. Theoreme.

[666.] Demonstration.

[667.] Corollaire.

[668.] PROPOSITION IX. Probleme.

[669.] PROPOSITION X. Probleme.

[670.] Demonstration.

[671.] PROPOSITION XI. Probleme.

[672.] PROPOSITION XII. Probleme.

[673.] CHAPITRE II. Qui traite de l’Ellipſe. Definitions.

[674.] PROPOSITION I. Theoreme.

[675.] Démonstration.

[676.] Corollaire I.

[677.] Corollaire II.

[678.] Corollaire III.

[679.] Remarque I.

[680.] Remarque II.