[21.] SCHOLIVM I.

[22.] SCHOLIVM II.

[23.] SCHOLIVM III.

[24.] PROPOSITIO XI.

[25.] PROPOSITIO XII.

[26.] SCHOLIVM.

[27.] PROPOSITIO XIII.

[28.] SCHOLIV M.

[29.] PROPOSITIO XIV.

[30.] SCHOLIV M.

[31.] PROPOSITIO XV.

[32.] SCHOLIVM.

[33.] PROPOSITIO XVI.

[34.] SCHOLIVM.

[35.] PROPOSITIO XVII. Segmenti fupradicti conoidis hyperbolici centrum grauitatis reperire.

[36.] SCHOLIVM.

[37.] PROPOSITIO XVIII.

[38.] SCHOLIVM I.

[39.] SCHOLIVM II.

[40.] SCHOLIVM III.

[41.] PROPOSITIO XIX.

[42.] SCHOLIVM I.

[43.] SCHOLIVM II.

[44.] PROPOSITIO XX.

[45.] SCHOLIVM.

[46.] PROPOSITIO XXI.

[47.] PROPOSITIO XXII.

[48.] SCHOLIVMI.

[49.] SCHOLIVM II.

[50.] PROPOSITIO XXIII.