[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.

[51.] PROPOSITIO XXIV.

[52.] PROPOSITIO XXV.

[53.] PROPOSITIO XXVI.

[54.] SCHOLIVM I.

[55.] SCHOLIVM II.

[56.] SCHOLIVM III.

[57.] PROPOSITIO XXVII.

[58.] ALITER.

[59.] PROPOSITIO XXVIII.

[60.] SCHOLIVMI.

[61.] SCHOLIVM II.

[62.] PROPOSITIO XXIX.

[63.] SCHOLIV M.

[64.] PROPOSITIO XXX.

[65.] SCHOLIVM I.

[66.] SCHOLIVM II.

[67.] PROPOSITIO XXXI. Semifuſi parabolici cuiuſcunque, centrum grauitatis reperire.

[68.] SCHOLIVM.

[69.] PROPOSITIO XXXII.

[70.] SCHOLIV M.